(Gajim was gnomed since June actually, Void Linux repos didn’t update to the new iteraction until a few days ago though so I wasn’t aware.)
Gajim was the best XMPP client for desktops, with a nice UI and all the features I’d ever need in a messenger (YMMV).
So of course it should have been turned upside-down with a UI redesign that removes compatibility with GTK3 themes while also looking extremely out of place on my system. Modern GUI design suck SO MUCH.
I’m not sure what the cause is exactly. Some say it’s user error and they just didn’t realize they had done something wrong, but i’m pretty sure there’s an entire subreddit dedicated to it lol. My guess is maybe you install a package that pulls in the entire gnome desktop as a dependency, but i don’t think that would make it boot into gnome by default just because you have it installed.