I can reproduce this and identified https://github.com/mozilla-mobile/firefox-ios/issues/12070. Can you please see if the problem goes away after force-closing the iOS browser, then doing a shift-refresh of the Firefox View page? If it does, then that issue is probably what you are seeing - if not, then there will be something else going on.
Bug 1789876 Comment 16 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
I can reproduce this and identified https://github.com/mozilla-mobile/firefox-ios/issues/12070. Can you please see if the problem goes away after force-closing then restarting the iOS browser, then doing a shift-refresh of the Firefox View page? If it does, then that issue is probably what you are seeing - if not, then there will be something else going on.