Critical Mass disappearing?

I was raiding Baradin Hold today, and noticed something strange. Whenever I applied Critical Mass to the raid boss, it would keep disappearing! It would disappear about one or two seconds after I put it on via Scorch or Pyroblast. It wouldn't expire from it's duration, it would just vanish off the target!

I don't even know what was causing it to disappear so fast, but if it helps, there was 1 priest, 5 paladins (no joke), 1 mage (me), 1 warrior, 1 shaman, and 1 warlock (maybe their spells interfered?)

Sadly, I don't have a video to actually show my situation.

Has anyone else experienced this problem, or am I just going insane?
http://raidcomp.mmo-champion.com/
Warlock was overwriting it with shadow and flame.

http://raidcomp.mmo-champion.com/
Warlock was overwriting it with shadow and flame.

Ohh ok, thanks for the info!