My problem is that whenever I import custom "character" graphics, the display is always just a little bit off. Example in this picture below: (the part that has been circled is a "character" graphic, and as you can see it doesn't match up the way it's supposed to.)

I have been driving myself crazy trying to figure out what is causing this, it is doing this for every single custom graphic I make. I am editing the graphics in Gimp and my dimensions are perfect 32x32. Here is a photo of the graphic in the editor with the dimensions:
Does anybody know what could be causing this and/or how to solve it. I'll appreciate any help I can get. Thank you in advance.