Dome/Scope Sync Confusion

I've got the dome rotating well and the shutter opening and closing well. I ran "measure all" in Beaver setup. I'm using Ascom Device Hub. I checked "slaved to telescope." The shutter follows the telescope, but it is 180 degrees opposite the scope. I spent a lot of time in the freezing cold trying to fix this, but I could not, I'm embarrassed to say. The solution is probably simple, but it eludes me. If someone could help, I would really appreciate it.