Faces behaving weirdly when using a knife tool

[zerki]

I have this problem but it happens only in one specific place, on the neck of the ork. When I try to cut the faces using the knife tool they are behaving weirdly, sometimes going inside the model and not sticking to the high poly model they are shrinked-wrapped around.

Here are images showing the problem. Did anyone encounter something similar?

[NP5]

Have you checked for things like the normals not all facing outwards? Or the possibility of double geometry in that area.

[zerki]

Yes, I checked both. Seems like the faces that are created by the knife tool just don’t want to stick to right places. I was trying to move them individually but it just doesn’t look right, I think the shrinkwrap modifier is just glitching.