Just selected a few rules I didn't need and hit the trash can at the bottom of the page. They didn't delete. I see the same behavior when trying to delete logs. Some delete and others don't.
just tried to delete rules & logs … works fine for me.
are you on the latest build? the were some issues on the rules page a couple of days ago.
Should be. I installed last night and I believe gui prompted me for updates 3 or 4 times since.