Algernon83 suggestion fixed it for me. You have no idea how aggravating this was, wondering what the issue was and no time to troubleshoot. HAHA, reinstalled davdroid and rebooted OC server and was about to try some more severe stuff. Thanks.
DAVdroid attempt to sync deleted calendar
On Roundcube I created a second calendar, which I deleted a while after that.
I synced both with DAVdroid to my Android phone and to my calendar on OSX.
When I deleted one calendar it was also gone on OSX but DAVdroid still tried to sync it.
Duplicate of #243. At the moment, DAVdroid doesn’t check for deleted or new collections but synchronizes the ones set up.