Misaki wroteHi, you have come to the right place! Though you have attached an image of your Spine settings, I can't see how Smoothing is set up from the image, so I suspect that may be where the cause is. Smoothing should be 0 for Pixel art. Also note that some of the viewport-related settings will not be reflected until you restart the editor.
Thank you!!! This really solved the problem. I realised that my original image was 640x640 instead of 64x64 which means that I only see straight pixels when I set the scale down to 0.1
Is there anyway to affect scaling so it will clamp to a 10x10 pixel base rather than a 1 pixel base? (I'm not even sure if I'm using the right terminology here, I hope I'm making sense!)