What Azura said, and if you're still having issues, maybe try to export it on the game again. I've never come across this issue so I'm not all certain how to fix it. I'd say it'd be a small problem, maybe try using a different browsers as well if nothing else works. I hope you get it fixed, good luck! And let us know how you go~ <3
Maybe this could help?
(http://i.imgur.com/RX0IN1F.png)
This is the file you'll need to upload.
Did you go into the Preset Maker in the Creative Den in the game?
There you export it and it should land in your Feral-Heart > presets folder.