Aseprite animations are no longer square when imported to unity

I am having a problem where the animations I am importing from asesprite do not stay square when I import them into unity using the aseprite importer. When I open the sprite editor each sprite is clamped to the pixels that make it up, ignoring any transparency that exists. The original sprite is animated on a 16x16 sheet, with each animation separated by tags, and these animations take into account this space when moving. Below is an image of the settings for the importer.

Please let me know if there is a way I can change the way I am importing this, slicing it or otherwise cause I can’t find anything online.