If your mappings aren't being updated that is strange. You can try to force it by deleting the mappings. Bin in the app_data folder, and restarting the application.
Orchard should recreate the nhibernate mappings and save as mappings.bin.
I have ran into the same issue, and the only way around it that I can find is to delete mappings. Bin (I don't need to disable and re-enable the module). In fact, this is the answer that I got from Bertrand when I asked why this was happening.
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