Nuki Web showing outdated authorizations, Error 500 on DELETE

I have run into a rather strange state, with Nuki Web and the Web API reporting authorizations that are not actually registered in the locks (not showing in the iOS Nuki App). After syncing the locks, the authorizations are still showing in Nuki Web. Trying to manually delete them via a Web API call results in an Error 500:

{"code":500,"description":"The server encountered an unexpected condition which prevented it from fulfilling the request","homeRef":"/","reasonPhrase":"Internal Server Error","uri":"http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.5.1"}

Is this a known issue? Otherwise I could provide some IDs that may help identify/troubleshoot it.

Yes, it would be nice if you could PM me the IDs so we can check it.