Today I activate the gravity , normally it should stay on for 4 s , and it just gone forever and everyone died xD

Happened to me to when my friend used the gravity he said Don't jump when i jumped after a minute i just flew with the eagles

I don't think its a bug though

Was it a dual shaman map? This certainly happens when the skill is used again in the time while it is already active.

Yes it was duel map

This must be a bug. If Gravitational anomally is used by pink shaman on a dual shaman map who isn't the sync, gravity will be disabled forever.