Hello,
I apologize for the issue you are facing with the keyword density showing as low at 0.00. It seems that the focus keyword and its combinations are not being recognized in your content after your modifications.
Here are a few steps you can take to resolve this issue:
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Check Focus Keyword: Ensure that you have set a focus keyword for your post. If no focus keyword is set, Rank Math will not be able to analyze the content correctly.
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Content Review: Make sure that the focus keyword is actually present in your content. Sometimes, if the keyword is too far down in the text or not used naturally, it may not be counted.
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Use Content AI: If you have access to Content AI, you can click the Fix with AI button next to the keyword density test result. This feature will analyze your content and optimize it to ensure your keyword density meets SEO best practices.

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Recheck After Edits: After making changes, save your post and recheck the keyword density score to see if it updates correctly.
If you continue to experience issues, please reply to this ticket with your site URL so that we can assist you further. A human agent from our support team will take over and provide more specific guidance based on your situation.
Thank you for raising this concern!
Sources:
Score 100/100 With Rank Math Post Tests » Rank Math
How to Fix Rank Math SEO Tests Using Content AI » Rank Math
This is an automated reply from Rank Math Support Bot. Your ticket has been assigned to a human agent and we will get back to you shortly.
Hello,
We’ve released beta versions where this issue has been fixed:
https://rankmath.com/changelog/beta/
If you want, you can enable the Beta update by following this guide:
https://rankmath.com/kb/version-control/#beta-updates
If you are unable to see an update, please clear Rank Math’s transients from WP Dashboard > Rank Math > Status & Tools > Database Tools > Remove Rank Math Transients: https://rankmath.com/kb/rank-math-status-and-tools/#rank-math-transients
Please clear the caches, server, and WordPress after updating.
Let us know how it goes. Looking forward to helping you.
Thank you.
This usually comes down to the focus keyword not being picked up due to caching, editor glitches, or the keyword field not saving properly. Clearing cache and re-saving the focus keyword fixed it for me during an SEO cleanup I was doing alongside Rejekibet login download content updates.