it may be unimportant. If you observed and compared with winter conditions, with numerous data points, using thermometers and hygrometers, we might have a valid data set. It isn't winter now, and so anything that happened today isn't indicative of much. No matter where you are geographically, what your climate is, and what today's weather is.
I doubt that I can add much to your thinking process. I don't know what your double ceiling is. In your pictures I believe I saw two layers of drywall. If that is what you meant, then my reaction is "it's not a concern, not a big deal". Two layers is just thicker drywall; treat it psychologically and analytically as if it were a 1" layer. However, experts may have other comments on vapor barriers and double ceilings.
A lot depends on local building practices, what will be deemed the right way to handle humidity. Note that closed cell foam can handle the dew point freeze point better than any air permeable matter. The big goal is to avoid letting humidity buildup and freeze in your organic building parts (wood, drywall paper facing). The dewpoint at the building envelope during winter. My saying this does not mean I can advise you more. I may already have said things not quite right and may get corrected.
What climate are you in?
david