soirry mate, what is capx?
A CAPX file is a file of your game saved as a single file.
I can load that and look at your layout to see the problem.
It looks like they are being stretched which is probably a sizing issue. That gets worse when you stretch them more.
If they look fine in game play it is probably your snap to grid settings not matching the tile settings.
I really can't help more without seeing a capx sorry.