Treasure goblin and butcher dont spawn often in nightmare dungeons?

i have 1 class at lv 70 and 4 classes at lv 60. and i have the feeling, that they spawned in normal dungeons much more, than in nightmare dungeons. can someone say something about it?

edit:

i leveled the 4 classes with normal dungeons to lv 50 and after that with nightmare dungeons to lv 60.

Oof, yeah, sorry – Blizzard strictly limits fun using their fun detector so those changes will, most likely, be shelved.