Image Trace is making sketches "squared"

Hey, 

I've got problem with the Image Trace option. I'm basically uploading my sketch .PNG file from ProCreate and it looks good, then I'm trying to use Image Trace and it makes some lines/shapes squared. As you can see one of the fingers is completely squared and the others are connected where on the sketch there is space between them. 

Top hand is with the Image Trace option and the bottom one is .PNG