I'm not able to reproduce the slice but here the current version, now the extra tracks are on opposite sides (?).
BTW, the wing profile isn't NACA 650-18 anymore, this version has the slat integrated as I have not figured out yet how to make and mount them to a wing.
CE3PRO_NACA 650-18 WING ROOT.3mfEdited by Mechatron127
It's hard to tell from the screenshot but I think they are there because that area is at an angle and Cura is attempting to maintain the wall thickness. If you would use the "File | Save Project" command and post the 3mf file someone will take a look.
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