Without benefit of the pics, it's hard to say what the problem might be, but generally mounts for H-H motors are pretty similar.
The only thing to watch out for is that they often have two scales - one on each side of the bracket: One is "Elevation" (Ignore that one) and the other is Latitude.
I would hazard a guess and suggest that it is more likely to be the dish backplate which has been assembled upside down (they are often reversible).
Anyway, I suggest you set the Motor Mount to the correct figure, then adjust the dish elevation so the face is vertical. This avoids confusion with the backplate scale(s) and if the dish can't get anywhere near vertical, then the issue is proved and the backplate needs to be reversed. If you can get near vertical, with a bit of up/down leeway, then all is well.
Then send to Thor and carry out your final tweaks - correcting Azimuth by moving the motor/dish as one piece around the pole and correcting elevation by raising or lowering the dish only (as you would for a fixed installation).
If you can upload the pics, though, that would be a great help (Go Advanced, then Manage Attachments)