I have a problem with Vanadium for the last few months. I have a bunch of groups with a bunch of different websites in them, but from time to time the websites will come apart from the groups and I'll have to tidy up again and again. Doesn't seem to be any setting affecting this as far as I can tell. Tried using Brave for a while, didn't happen in Brave, but somehow, and quite often, Brave would mess up a website so I could not navigate in the menus, but that seemed related to the blocking of cookie pop-ups. I went back to Vanadium anyway, but the problem with sites going off their groups persists.