Thanks to all for your helpful answers.
I am using a walking foot and I just watched the video for
the pressure foot which needed a little adjustment, however
I forgot to mention that I was using monofilament thread.
I think this may have had a lot to do with the problem, because when I changed threads, there was a big difference
although still a little bit of pucker but not enough to worry about.
I will play with the pressure until I get it perfect.
Thank you all. I appreciate it.
Elaine