OP, even if you didn't add any extension lately, could you check what's on your extensions list currently?
That pop up of "No definitions available." seems like an extension-related for me, or could I be missing something in the Google Chrome's settings.
That pop-up bubble could be the culprit.
As pugman suggested as well, try to load it in Incognito mode since most extensions aren't enabled by default in it.
If the issue didn't happen in Incognito, it's most likely one of the the extensions you have right now.
If the issue still persists, it's most likely in the browser. Resetting the browser from settings would do.
Edit 1:
I installed Grammarly extension and enabled "
Show definitions and synonyms via double click (all sites)". The issue happened to me as well.
It isn't just in the profile page but to other pages of the forum as well.
@OP and to others experiencing the same issue.
Just disable the "
Show definitions and synonyms via double click (all sites)" in your Grammarly extension's settings and you should be all good.