So you are actually doing a MapShare correction for a BUILT-IN poi category, rather than adding your own user-POIs That's significant....
(It also means you won't see them as .ov2 files in the map folder).
It looks like your Mapshare corrections are being deleted when you upload them, but so far I haven't thought of a reason why this might be happening....
When you next do a MapShare update, can you check to see if your new hotel vanishes immediately after you get the corrections?
And can you then try it next time with the option to UPload your corrections un-ticked?