@xxERICxx
This is drifting off topic but to answer your question you will need to post more information.
OpenBSD Developers put a great deal of effort into keeping documentation current. Because of this, the version of OpenBSD you run is important to post. I would review
/usr/local/share/doc/pkg-readmes/gnome. The gnome meta package
README-main for current suggests that you could be having several issues like user permission for drm, dbus, memory limits for OpenGl, etc. This readme has undergone several revisions on the way from 5.3 -> 5.4 -> current.
In general you will be well served by reading all of the pkg-readme's.