Close the notebook and re-open this will erase all cache file of the notebook and reload based on the version you have saved on OneDrive. Action path: File > Info > Settings (of the notebook having problem) > Close File > Open > (choose the notebook)
 Delete the page in Web Browser version of OneNote very simple, just visit onenote.com open the notebook by web browser. delete the page there and let your desktop client refresh. this one take a few more steps but I will work easier.
close the notebook one desktop client > visit onenote.com > login > delete the said page > close the browser > open the notebook again on desktop client
I believe what causing this is about the conflicts of versions uploading/downloading to/from cloud. If you have saved your notebook on OneDrive it should work. Hope it helps. otherwise, bring it up again. :)