Does it only do this on the one book, or on all of them.
If peculiar to the one book, has the epub you are reading been converted from azw3 or mobi? If so, the problem is probably the table of contents, which for some reason Moon Reader seems to use to progress in normal reading. The latest version of Calibre has been modified to fix this problem, but you need to delete the book, import the .axw3 file and convert again.
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