Take note of the shape in the top left. I copied the 9 tiles, the same as shown in the tile editor's upper left, and it's using other tiles. Also, look at the bottom left. It's using the tiles in the upper left, but it's swapped the left, right, up and down around.
I think I have the tiles set up correctly, but can anyone see anything I've done wrong?
I can't tell if it's something I've done, or a bug in Construct.
It's a shame, because I could do almost everything I want using Auto16, but it's missing a fill space.