Total Damage Dealt Bug

I have noticed several times that I will finish a battle where each of my toons dealt damage, but the "Total Damage Dealt" line on the progress screen does not reflect each toons' contribution. Sometimes, the Total Damage with be zero, even when my toons dealt significant damage. This seems to be a bug in the game and mostly effects raid games. Please post here if you're having similar issues. I took a screen shot of this issue, but I am not sure how to post it in this forum.