Enemies health bar not showing when damaged

Usually there's two ways to determine an enemy's health, the color of the small box with their class picture and hit detection when you damage them.. even when overhealed, the damaged health bar would show the white bit decrease.. i played a game yesterday where i damaged the enemy and the bar didn't show...all that was there was the box with the class and it stayed green i assumed he was hacking and accused him of so i feel bad now as i realise it might just be a bug.. apparently he was overhealed so that may account for the reason

sorry again jotun? if you're reading this