Price List Issues

Hi -
I'm new here and trying to set up some galleries. I have a few listed and I've been trying to set up my prices. I have adjusted them a few times, and finally got them where I want them, but some of my images seem to have different prices than others for the same size, and they should be universal. I understand about the print on demand addition plus the paper costs, but some of my pics have the price I want, say $14.00 mark up for an 8x6 and then others say that I have a $23.00 mark up on a different image, and others say $28.00 mark up. I found out yesterday that I should never have 2 windows open to FAA at the same time, so I thought that was my problem, but the issue is continuing today. I went back to check the prices in the edit mode, to find out most of them had disappeared and when checking on a price in a gallery they reverted to the first price I listed. This is beyond frustrating. Any suggestions, please? If you look at my Bodie gallery here: http://fineartamerica.com/profiles/claudia-kuhn.html?tab=artworkgalleries&artworkgalleryid=256862 you will see Arrested Decay at $26.00 for the smallest print and General Store for $42.00.
Thanks!