Note: i upload the addon updates as zip files.. the server (or mod?) had to first extract my archive ... mess with the files, and then zip them up again.
looking at the timestamps of the files inside the archive, the file timestamps got changed too... looks like whoever messed with my zip archive (=the server?) is in the UTC -6 timezone
also.. this time difference is probably also one of the reasons that Curse Client is broken... it can't detect the update because of the messed up timestamps?