My first guess would have been that you played sharp which happens so easily with soft uke strings. I try to put the hardest strings on that I can find to avoid it. But as you ruled that out already, I can only guess that it does not have a compensated saddle. Hopefully a luthier can fix this by making the saddle adjustment, and also document any expenses and adjustments for recourse from the dealer or manufacturer.
It seems you bought it online so that sometimes can complicate and delay communications and customer service. Good luck with getting this fixed before the holiday.
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