The canvas size for each tile is 500 x 500 and the blocks themselves are 390 x like 450ish... Still sorting that out. Am I doing something wrong or is there a reason you list it at 390 x 115?
The canvas size is 500x500, in order to crop all tiles evenly, making them more easily implimented, but the tiles themself are smaller than the canvas. The grid you need to impliment them needs to be 390 x 115 :)