PrisonMMO bug

Your username:
Table14
In which minigame/server does the bug occur:
Prison MMO
Detailed description of bug:
I was in the cave, killing mobs, when I died, so I ran back and picked up all my stuff, and had to go.
So when I came back about 5mins later, and logged in, and I was being attacked by nothing! I could see the blue "taking damage" hearts, but couldn't see mobs. So i hit the air randomly, and got kicked for "Sending too many packets". When I rejoined again, the mobs were still invisible and unhittable, so I kept running away, died twice or three times, then I was successful in going to /spawn.

I am unsure what caused the mobs to become invisible.
It was only a handful of cave spiders (the ones attacking me) that were invisible, I could see further away cave spiders, and creepers.

Thanks for your time
-Table14

I just had it happen again, this time I was mining acacia, then when the cave spider hit me, it turned invis.