20
Clicking on my profile shows me someone else's profile
(lemmynsfw.com)
A community for the mobile app Connect for Lemmy.
Something similar happens to me, when I login to the desktop site on my pc. I'll briefly see a different username in the top right, before it switches to my own. It's never been the same other username either, and so far, has also been actual users that it has shown me.
So based on that, I don't think it's Connect doing this to you. But I don't actually know.