It was all corrupted or something when opening it before. I could see other windows in it. I compiled the git version, there’s a PKGBUILD in the AUR for it. Now it looks how it should.
I wonder if Manjaro updated something, and didn’t recompile OBS. Or maybe it doesn’t like Deepin, the stable version. If they didn’t recompile it, it would most likely get a library error, saying it doesn’t exist.
I never tried opening it in a different desktop environment.