Question about the SD-513 of Konica minolta

Hello guys,
We have the 6100 connected with the SD-513 (Square Spine) finisher.
I found that the crease is making the booklet a little bit of skew and when i make booklet without the crease is coming out perfect
I asked out tech guys and they said that the manufacture says that the crease has 2mm+- of skew.
this is really weird for me to hear that.
do people here who also have the machine came across this?
this is really intrests me
Thank you.

 

I do know that when the cutting blade begins to dull I use experience skew in my booklets. Try turning off the trim, and keeping the score on - see if it still skews.
Also try a different media, and make a booklet like you normally do - does it still skew? perhaps the grain of the paper is resisting the fold.