I always put a folded insert in a card so don't tend to have that happen - maybe it stuck as you put the mat down but it was a little crooked and when you smoothed it out you got a crease.
When I put the insert in the card I fold the insert and put in the card so that it's flat on the back section, I then put DST on the inside of the front cover as near to the fold as I can, I then close the card and this then sticks to the insert.

Some put the DST on the back section - I like to stick it to the front so that the insert opens as you open the card. HTH

Jan

Last Edited By: Cdteach Jun 2 11 9:21 PM. Edited 1 times.