Bug Wither invasion! or just a bug?

[Tolekkeks]

Hi, recently i was playing Direwolf20 1.7.10 ( v1.0.4), and im getting a bug in the nether:

I wanted to farm wither head`s , so i created a platform for them. First off all i only got 3-4 withers, but now i get abour 50-100 withers ( see picture) and my pc drops to 1 fps -.-, the only way to bring back performance is making the game peacefull.

Did anyone ever had this bug ?

maybe its because i added some mods by myself?
mfg Keks

 

[the_j485]

Wrong place, buddy. This should probably be somewhere like General FTB chat.

 

[Master_Builder_800]

dire wolf mentioned that he had this bug himself for your information, forget the episode though....