It is normal.
Happens to me on CRK, ZT, numerous liner locks etc. It is all about the lock angle. If you unlock it it goes back to normal correct?
Two of my lost used customs (one dating to 2013) does this. No issue what so ever.
My CRK dating back to 2010 does the same. Still has no issue and you can see how beat up that one is in the CRK sub forum.