Strange Movements

Hey

I have a Object with very small perimeters in it, works so far, but as you can see on the screenshot, after finishing each tiny square (during the retraction) the head moves to some position on the edge of the object. which of course damages the outer perimeter and makes unnecessary strings... this happens only on perimeters, not on the infill. i think i tried now all options in slic3r, but i cant figure it out... anybody some suggestion?

thanks a lot in advance!