A reduction on that particular night, without any conditions that might have warranted it---late port night, chic night, yada yada. There are variables that could affect the availability of stations in OVC on a given day--- we only seem to have a limited snapshot of 1 evening.
Not so. There are multiple posts on this forum where posters complain about having to cancel cruise planner purchases that posted to their credit card (default) because they failed to choose OBC as default payment method.
Celebrity's new "connecting" cabins don't really connect. There are doors in the hall that are closed to create a small vestibule common to the regular cabin doors.