Clicking usernames sometimes get stuck at loading

Hey guys

Might be just me, but whenever I try to click on certain usernames, I'm getting the issue that it doesn't load or gets stuck at 'loading' in the top-right corner. It's only because I've had it happen a few times to me now, that I'm starting to think it might be not only me who's having this.

Whenever I click on other usernames, can be even in the same page without refreshing, there is no issue whatsoever.

As a test I would like you guys to check out the following thread:

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Clicking on the OP, the profile pop-up doesn't load when I click on it.

All the other posters get the pop-up without any issues.

Any idea what's causing this?