After using the RankMath troubleshooter, my SEO changes still dont save

Website is democracyrebooted.com
(I was using a staged site – https://democracyrebootedcom.stage.site/)

Here are the errors in the console after making an edit to the title and doing an update:

load-scripts.php?c=0&load%5Bchunk_0%5D=jquery-core,jquery-migrate,utils,wp-polyfill-inert,regenerator-runtime,wp-polyfill,wp-hooks&ver=6.2.2:5 JQMIGRATE: Migrate is installed, version 3.4.0
lodash.min.js?ver=4.17.19:9 [Violation] ‘setTimeout’ handler took 73ms
api-fetch.min.js?ver=bc0029ca2c943aec5311:2 POST https://democracyrebootedcom.stage.site/wp-json/rankmath/v1/updateMeta?_locale=user 500
T @ api-fetch.min.js?ver=bc0029ca2c943aec5311:2
l @ api-fetch.min.js?ver=bc0029ca2c943aec5311:2
(anonymous) @ api-fetch.min.js?ver=bc0029ca2c943aec5311:2
O @ api-fetch.min.js?ver=bc0029ca2c943aec5311:2
(anonymous) @ api-fetch.min.js?ver=bc0029ca2c943aec5311:2
o @ api-fetch.min.js?ver=bc0029ca2c943aec5311:2
(anonymous) @ api-fetch.min.js?ver=bc0029ca2c943aec5311:2
O.method.r @ api-fetch.min.js?ver=bc0029ca2c943aec5311:2
(anonymous) @ api-fetch.min.js?ver=bc0029ca2c943aec5311:2
(anonymous) @ api-fetch.min.js?ver=bc0029ca2c943aec5311:2
o @ api-fetch.min.js?ver=bc0029ca2c943aec5311:2
(anonymous) @ api-fetch.min.js?ver=bc0029ca2c943aec5311:2
(anonymous) @ api-fetch.min.js?ver=bc0029ca2c943aec5311:2
t @ api-fetch.min.js?ver=bc0029ca2c943aec5311:2
(anonymous) @ api-fetch.min.js?ver=bc0029ca2c943aec5311:2
v @ api-fetch.min.js?ver=bc0029ca2c943aec5311:2
(anonymous) @ api-fetch.min.js?ver=bc0029ca2c943aec5311:2
(anonymous) @ api-fetch.min.js?ver=bc0029ca2c943aec5311:2
(anonymous) @ api-fetch.min.js?ver=bc0029ca2c943aec5311:2
A @ api-fetch.min.js?ver=bc0029ca2c943aec5311:2
value @ gutenberg.js?ver=1.0.119.1:1
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
n @ data.min.js?ver=90cebfec01d1a3f0368e:2
emit @ data.min.js?ver=90cebfec01d1a3f0368e:2
i @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
p @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ redux-routine.min.js?ver=d86e7e9f062d7582f76b:9
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ core-data.min.js?ver=fc0de6bb17aa25caf698:2
await in (anonymous) (async)
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ redux-routine.min.js?ver=d86e7e9f062d7582f76b:9
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ editor.min.js?ver=1fb5fcf129627da4939e:19
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ redux-routine.min.js?ver=d86e7e9f062d7582f76b:9
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:9
(anonymous) @ editor.min.js?ver=1fb5fcf129627da4939e:19
(anonymous) @ editor.min.js?ver=1fb5fcf129627da4939e:19
Xa @ react-dom.min.js?ver=18.2.0:10
B @ react-dom.min.js?ver=18.2.0:10
(anonymous) @ react-dom.min.js?ver=18.2.0:10
$e @ react-dom.min.js?ver=18.2.0:10
qe @ react-dom.min.js?ver=18.2.0:10
(anonymous) @ react-dom.min.js?ver=18.2.0:10
fl @ react-dom.min.js?ver=18.2.0:10
V @ react-dom.min.js?ver=18.2.0:10
Ze @ react-dom.min.js?ver=18.2.0:10
de @ react-dom.min.js?ver=18.2.0:10
ce @ react-dom.min.js?ver=18.2.0:10
post.php:1 Uncaught (in promise) {code: ‘invalid_json’, message: ‘The response is not a valid JSON response.’}
Promise.then (async)
value @ gutenberg.js?ver=1.0.119.1:1
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
n @ data.min.js?ver=90cebfec01d1a3f0368e:2
emit @ data.min.js?ver=90cebfec01d1a3f0368e:2
i @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
p @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ redux-routine.min.js?ver=d86e7e9f062d7582f76b:9
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ core-data.min.js?ver=fc0de6bb17aa25caf698:2
await in (anonymous) (async)
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ redux-routine.min.js?ver=d86e7e9f062d7582f76b:9
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ editor.min.js?ver=1fb5fcf129627da4939e:19
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ redux-routine.min.js?ver=d86e7e9f062d7582f76b:9
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:2
(anonymous) @ data.min.js?ver=90cebfec01d1a3f0368e:9
(anonymous) @ editor.min.js?ver=1fb5fcf129627da4939e:19
(anonymous) @ editor.min.js?ver=1fb5fcf129627da4939e:19
Xa @ react-dom.min.js?ver=18.2.0:10
B @ react-dom.min.js?ver=18.2.0:10
(anonymous) @ react-dom.min.js?ver=18.2.0:10
$e @ react-dom.min.js?ver=18.2.0:10
qe @ react-dom.min.js?ver=18.2.0:10
(anonymous) @ react-dom.min.js?ver=18.2.0:10
fl @ react-dom.min.js?ver=18.2.0:10
V @ react-dom.min.js?ver=18.2.0:10
Ze @ react-dom.min.js?ver=18.2.0:10
de @ react-dom.min.js?ver=18.2.0:10
ce @ react-dom.min.js?ver=18.2.0:10