Figured it out!
Thanks!

What did you do?

You should never glue the vinyl to the foam you'll always get wrinkles

Agreed. Gluing vinyl to sew foam as opposed to perimeter stitching it causes wrinkles in the cover

Yes I agree with the no glue, but what was the solution.

Do your plates first then sore around the edges is your putting together any project steam it that should take out any wrinkles if not when you're done you can also what a towel and iron it from the top be careful

HI I did a couple of things: removed cover then scored the foam, that took care of most of it, then I steamed it and worked (rubbed) the material, and that took care of the rest of it.
The problem wasn't the glue, which I use sparingly, but that I folded the material when I was doing the pleats. On the subsequent ones, I was careful not to fold the portion that already had pleats, and they turned out beautifully.