Forum:Wiki Background Problems

On my wiki, I have a picture that is "tiled". I edited that image for Christmas, and tried to upload it. But this time it said it wasn't the right size, even thought I clicked "tile". I did it before with the exact same size image??? What's up???

http://images3.wikia.nocookie.net/__cb20121203024439/central/images/thumb/0/0b/Hiya.png/165px-Hiya.png 01:54, December 5, 2012 (UTC)