This is typical of many graphics engines. The easiest way to fix it is to have a single pixel "border" of transparent pixels around every single sprite in the sheet.
I'll have to see if that option is available to me through my software of choice Pyxel Edit, its going to be awkward making 9x9 Tiles and only filling out 8x8 of them XD Thank you for the Suggestion though I will definitely try that!
