I'm seeing this issue as well -- paid $10 a year ago, and while I can find the "you paid for this, so here are your downloads" page, it only has the free versions. It really looks like there's something misconfigured on your end.
Sadly it's not, this is not the only game this has happen on. Eternum recently increased their price and Itch locked out people who bought in at a lower cost. Love and Sex bought that one on sale can't download that one ether until it goes free to everyone. It seems Itch has no means for devs to increase there price nor the ability to handle sales past an initial download. Try to contact Itch to get answers good luck. Stop buying on Itch