If we read back through JB’s correspondence on the subject (some of this was on discord, in addition to the official forums), he said they ran some scripts both before and after the 1st cake collection ended to try to adjust the leaderboards to reflect reality. Your problem, and I expect others, is that you were in your original region when the 1st scan was done, and subsequently transferred. Apparently the deliver of rewards was based on the information from the 1st scan.
Yea, I’m confused too how they could deliver your rewards to what should be a non existent account in the old region, but that is what is happening. Probably the act of granting the rewards “invents” the account in the old region in their database regardless of whether it exists.