Not usable with current weapon set settings

I have skill gems with "Not usable with current weapon set settings" icon and no interaction with them changes this. I can still use this skills. I do not understand why they are "not usable" if it is not. Seems like a bug. Skills set to ws 2.
Screen with ws2 setup and working skills on the right:

I have this same issue. Hopefully someone has some insight

Same here!
I once fixed it by un- and reequiping my ring. But it doesn't work this time (and neither did any attributes change)