First, a character cannot be healed for more than it is damaged, in other words, ‘overhealing’ doesn’t count, except for the Mi’da fight. Second, healing doesn’t remove bleeding entirely since Patch 23.0:
Multiple stacks of Bleed will now be combined into a total Bleed count that can be reduced by healing, instead of erased entirely.
Thus, if the amount of ‘bleed’ damage is greater than the healing received, some of it will still remain.