On openHABian the update process is basically the command sudo apt-get update; sudo apt-get upgrade. As part of that update the openHAB cache is supposed to be cleared. The installed bindings get stored in the cache so that will force openHAB to reinstall the bindings. OH always pulls the versions of the bindings that match the version of core so it will upgrade the bindings when it reinstalls them.
It sounds like something went wrong with the clearing of the cache. Next time you can clear the cache manually. See Clear the Cache to force the add-ons to be reinstalled.
I’ve never seen this particular problem reported so hopefully it was caused by a momentary hickup on your system and it won’t happen again.