If you are talking about the quilting lines around (outside of) the Dresden plate, then I really cannot see the problem in this photo.
Edit: What brand (and ply and weight, if the spool tells you) of cotton machine quilting thread are you using? I never use thread that is specifically branded for machine quilting, so I'm not sure what size it is. As Jane Q pointed out, your needle size needs to be correct for your thread size.
Also, how long is your stitch? The quilting stitches look on the short side to me, and stitch length can affect the quilting.
Last edited by Prism99; 02-19-2017 at 02:52 PM.