why whif some mod's, custome mob's that are friendly, sudendly attak villager?

so, i have this happen 2 time's now, i don't know why:

i had mod impruved mob's and olso guard villagers, and mcreator mod (like plenty of golems), then the friendly, mob's start attaking villagers like crazy! i have no idea why this is hapening, becose on there own (i meen mod's), these mob's act normaly. can someone explane?