This has randomly happened to my oathkeeper paladin twice in Tiamat and also during a Well of Dragons dragon run today. Casting Divine Shelter will not shield allies, not even a little shield. It uses divinity, but does nothing. I have to spam the power 3 times for it to work. Also sidenote - ranger's Stag Heart doesn't shield allies in zone, only in group. Is this working as intended? The tool tip doesn't specify only group allies.