Hello, I’m sorry to hear that you’re experiencing issues with Rank Math. To exclude the 404 page from Rank Math and prevent it from generating titles, descriptions, or any other tags, you can follow these steps:
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Go to your WordPress Dashboard and navigate to Rank Math SEO > Titles & Meta > Misc. Pages.
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In the Misc. Pages settings, you will find the option to exclude the 404 page from being indexed and generating titles and other tags.

By enabling this option, you can set noindex on the 404 page to prevent it from showing up in search results and generating titles and other tags.
I hope this helps! If you have any further questions or need additional assistance, please feel free to reach out to our support team here. We’re always here to help!
Sources:
How to NoIndex Paginated Pages » Rank Math
How to Disable All Rank Math Generated SEO Tags » Rank Math
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.