This could be me, but I recall being able to hover over a user avatar in the “Results” of a poll, and you’d get the expected response: the user card in a modal. Currently, that’s not happening. We’re running a large mock draft, and this has become an unexpected pain for the admins who are tracking votes.
I could be wrong but that doesn’t sound like Discourse convention at all. The convention is you need to click an avatar to bring up the User Card.
Perhaps you were thinking of this Component?
(the downside of which appears to be that it causes a lot of 429-itis! 
)
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Click doesn’t work either. Sorry, should’ve linked to this earlier. Poll Pick 60 Poll - Lions Den Mock - The Den
On my local with the latest Discourse version, it works as expected.
Indeed, nothing happens on your forum. Looking at the HTML, it misses the user card link, e.g.:
<a data-user-card="Arkshine"> <img.../> </a>
From what I see, you’re using Discourse v3.3.3.
The latest version from the stable branch is 3.4.2.
I would try to upgrade first.
Edit:
I can see it has been fixed here in v3.4.0+ by Robert:
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That … is really, really funny.