Is Blenders Bevel Tool broken ?

Hi there !
Blender doenst want to deliver me nice bevels, and i really dont know what else i could do. I’m on Blender 2.79 and when i bevel an edge that is not from a perfect cube, the result is skewed.

I already applied all the transformations beforehand, but that didnt seem to make any difference even tho the values are all back to 1. I really can’t believe that this is supposed to be this way, and i hope someone here can help me.
Thanks in Advance :slight_smile:

You have mode set to “percent”?

ctrl+A for apply scale