Explosive graphics?!?

While that is good and everything, that's not my case: i paid a lot of attention and they were the exact number of colors. (in particular all those sprites are 8 bit palettes, so it's even easier identify them)

Besides if you exceed the number of colors, in FF6SE you'll see immediately some color becoming transparent or some unexpected color, but not a crash.
Until now, when i skrewed the number of colors, they always were more than expected, not the opposite. When that happens i remove one color and repeat, until all colors fit in the 16 slots, or until the n. slots becomes 8.

On a side note looks like you're talking as if i still have to solve the problem:
If that's the case... well, you missed a post, i've solved the problem adding a single pixel in order to avoid 8 bit long borders.