The profile page display is showing Communities(1) in this profile.
I think it must be Community(1), i.e. using the singular form.
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Not really. 'Communities' is short for 'List of communities', and the '(1)' behind it isn't part of a phrase. In English (and IIRC almost all languages), the number always comes before the word it pertains to.
It would be different if it said '1 Communities', then it would qualify as a pluralization bug, but it doesn't.