AFAIK the random jump back is a common problem of the Mobipocket Reader program. It is not easy to go back a page in HTML. HTML is a format which has to be rendered from the start of the file to get good results. Due to the memory and computing restraints of PDAs Mobipocket Reader has to use the blocks of data the .prc file format uses to go back in the file. This can easily cause problems in finding the previous page.
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