On console using couch coop if both players have pools and one person dies, it removes the marker for the pool from the other person. If you log out and log back in, the marker is reset on the person who still has the pools.
There is a dedicate bug report for Console versions: Console Bug Report - Diablo 3 Forums
You can repost there or move this post by editing it and changing the category field.
sorry, thanks 20 chars