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That's a 2.3.x bug which was fixed in 2.4.0 if I recall correctly, although I haven't heard of anyone with 20-30 pages jumps, so I assume something didn't work right with your update.
You can try to log out of your account on the kobo and log back in, that should create the db on the reader new, and fix most problems that come from a faulty db.
If this doesn't help I would suggest a factory reset and then update again to 2.5.1.
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