My Discourse avatar appears stretched at https://help.nextcloud.com/u/rokejulianlockhart/summary and beside posts like this one.
Your fancy JSON code snippet in the name field is causing this. When I added it to my profile, it did the same thing.
This is happening with all the profile pictures, probably due to some custom CSS they have added to the site.
But who cares? This is a support forum, not Instagram 
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Me, because it’s a bug. I mean, if anyone was gonna care, it’d be the guy who writes his name in JSON, right? Since there’s no dedicated bug tracker for this instance bar this tag though, I think this is adequate. I guess I’m gonna stay stretched for a while!