As I told fuwok in IRC last night, my best bet would be its not a bug.
1) As far as I know, the rings are not finalized (see: tank ring has worn Planar shield effect, not a casttime spell)
2) Quite possible they weren't intended to be equipped yet at all, and some coder accidentally through slots on them, or they were patched in at the wrong time.
3) The zone itself isn't even complete, as the final boss is no longer even spawning. I'd wait until thats worked out to worry about the ring.
It's clear somebody on the Dev team is not happy with these rings just yet, just give it a little time and I'm sure you'll be happy with the end result.