Hi!
no, I did not change anything in the hair settings before "set roots" besides setting the link geometry.
After your comment I tried all kinds of different settings in the guides tab but it did not solve the issue.
The strange thing is that it works on most parts of the mesh, I really don't know why it snaps like that just on the back of the head. I checked for normals directions, illegal polygon structure etc. but everything is clean.