I have seen this occur for the following reasons:
Does it happen with all tables, even tables on other pages? If yes try clearing your cache.
Does it only happen on the one page? You could try copying the content to a different page and see if the issue persists. If it does I would suggest deleting the table and rebuilding it.
@Vinay Sharma I think this app will copy comments https://marketplace.atlassian.com/apps/22929/copy-page-tree?hosting=cloud&tab=overview
I also believe that there is an enhancement request to copy comments on page clone.
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