Some time on the spot i cant see mobs/players ? How fix this?

This is because there are too many monsters usually they dissapear for around 10/15 sec the way to fix this issue is by reducing the amount of the monsters but since the chat is still active we decided that the problem is acceptable and the monster count is good..

Note: It doesn't happend every time but since we are going to update spots in arena mainly you can choose another good spot to fit you