Unable to use World Transfer

[kraken9]

I've been trying to transfer worlds, but I'm getting the message that I can't because 90 days haven't passed since my last world transfer. The thing is, 90 days HAVE passed since I last transferred. My payment history shows that my last was on Dec 19, which is 96 days ago.
I don't have anything in-game that should be preventing the transfer, so I'm confused about why this is happening.