Have you tried rebooting? Rebooting has tended to work better for me than just trying to sync again.
If rebooting is no good, does sync work for non-overdrive books? If you're having general problems with sync, signing out of your account on your kobo and signing back in might fix things, but be aware that you'll have to set things up again (settings, customizations, downloaded books, possibly sideloaded books).
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