UPS Canadian Shipping shows up for Mexico

We just had an order come across from Mexico using UPS Canada Standard. I ran some tests and no matter which address in Mexico I use, they are in fact able to select UPS Canada as their shipping option.

If I use an address from any other country however (besides Canada), they are unable to use UPS Canada and only see the correct options.

Anyone know where to start on this? :confused: Currently on 1.3.5x

I see this as well, using 2.2.3 Professional