Something wrong with my drawn objects

Hello! I drew my character bit by bit and there’s seems to be a problem with some of the objects. There’s these lines: (Image doesn’t work, try this:

Is there something wrong with my export settings?

Seems like a transparency issue… Do you have the same line artifacts after you exported your animation/still in Synfig? Can you attach the sif file with png’s so someone can have a look at it?