Great mat but...... - Real Avid Long Gun Smart Mat

I really like the mat in general. It’s a good size, it absorbs liquid solvents without them leaking through, it protects the finish on my workbench and the little tray on the end is very handy. However the one I received has a raised crease from top to bottom just left of the center that I can’t get to lay flat. I’ve tried laying a weighted straight edge along the crease and left it on for several days. I tried laying a towel over the crease and using a steam iron hoping it would relax the material. I’ve tried many things and it has improved a little but it’s still won’t lay flat at the crease. It’s a little disappointing. I’m guessing this happened when the item was boxed up by the manufacture, other wise I like it and will continue to use it.