I have a theory too and I reckon you're both way off. Supermod IP check powers don't always work btw. My IP will show as Sydney but I'm in Melbourne.
I echo the comments about the racks. I hope we were just unlucky because there are positive reports about the products out there on the web. I've got a theory that because we ordered three, the parts may have been mixed up. Because they're one-offs and not mass produced items (AFAIK) the tolerances could end up way out if the parts and mixed and matched. I don't know because I wasn't there when the racks were assembled, but I'm sure Minh knows the answer.