Hello,
Thank you for contacting Rank Math and sorry for any inconvenience that might have been caused due to that.
You can Bulk Edit your Posts, Pages, Products, etc. and remove the Rank Math’s Title, Meta Description at once.
Have a look at this knowledge base article for further information on this – https://rankmath.com/kb/editing-seo-meta-at-scale/#wp
For the Content AI, could you please disconnect and reconnect your site to Rank Math. You can do that from WordPress Dashboard > Rank Math > Dashboard > Help.
Have a look at the below screenshot for your reference –

Post that, check if you are able to edit the Content AI keyword?
Hope this helps.
Looking forward to helping you. Thank you.
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.