Backwards on page turn

Hi,

I have a Kobo Glo HD and when I go to actually turn a page (345/500 to 346/500) in a sideloaded epub, occasionally it will go back to the previous page, or more (344/500)

I have been reading about possible database corruption, but have no idea how to correct this. I have already tried factory resetting the device.

I am running the latest firmware. I don't think its an issue with the specific epub as I found a different version of the same book and it had the problem as well.

Any ideas?

Thanks,
lexman