Can't update listing prices - Please help!

I can't update the prices on some of my listings. Everytime I do it changes for a while and then reverts back?

I've tried everything, updating in Seller Central, through an inventory file upload, but it just keeps chaning back to the original price?

I uploaded an inventory file a few hours ago, then ran a search on Amazon and the price was correct. Then I just got an order but it came through at the old price. I checked Amazon again and its reverted back?

I've had to turn some of my procust off as they are selling at a loss, and support arn't much help.

Does anybosy know what the issue might be?

Any help much appreciated. I'm at the end of my tether with selling on Amazon! :0/