Black line after image trace

Hi all!

I am really an Illustrator noob, so I hope you can help me! I already tried to find the answer in this community, but unfortunately I haven't found the answer yet. I make my drawing in Procreate. I export it as an .tiff file, import it in Illustrator and use Image Trace. In Image Trace I use ignore white and only the fill (not the paths). If I then change the color from black to for example white, I get a small white line - see the picture below. Is there a setting I don't know it exists? Thanks a lot in advance!