Adobe Animate spritesheet misalignment

Hi,

I've got an issue that occurs when I export spritesheets on Adobe Animate version 21.0 where each sprite in my sprite sheet moves slightly to the right - see below:

If you highlight the image you should be able to see the grid I've put in to make it clearer. I've tried a multitude of different export settings which doesn't seem to fix anything. On previous versions of the software, this didn't seem to be an issue. Any help would be greatly appreciated

Cheers