I have repeatedly encountered a problem when a customer sent the same amount twice, seeing an error message after the first payment, and everything would have been fine, you could have requested a refund, but with a refund there are even more problems: watching other authors, I often see that Boosty users rarely get their money back, the amount hangs somewhere in the air, and I really wouldn’t want to expose my donaters to such problems.
I’m very sorry that once again such problems are happening on the site, but I hope that this bug will be fixed soon...