Jo...are you listing from Internet Explorer? If so that could be problem. Auctiva is having major problems (unless they have been fixed recently) with jumping pages. You can download the Mozilla Foxfire browser and use that for your browser and should not have as many issues with that.
OR, I think if you hit something like the $$ space or some other spaces before hitting save it may prevent it. IT is major hassle to remember to do that though.
Hope this helps you.
Vickie