Ok, I took a screenshot and then opened up your bmps for 0, 4, and 5. In the shot below, your files are on top, mine are on the bottom.
They're identical in size (4x8 px) and I tested the colors between the two using the PS eyedropper. They're the same. There's no difference between your numbers and mine.
Not sure if this would help, but it would appear the actual number takes up a 6x8 px space. Maybe open up the image slightly? Here's a png snapshot of one of my tables.
