I meant, like on killing blow, I had maybe 40 bags on the ground then I killed him and some extra mesos bags were left on the ground.
I killed them like I usually do: mesos explosion. When he was about to die, the mesos bags did explosed normally and disappear (except the extra that I reloot cause he was already dead).
Did you notice anytime during fighting it the Meso bags exploding but not disappearing? There is no other known issues with Meso Explosion that could cause this.