unequal separation of parallel segments in 3d print

[aliyazdani1372]

hi.
I work with a cartesian 3d printer with a MarlinKimbra firmware. In printing plug shapes as shown as in the figure below, parallel segments are approximated and distanced every other one. Though, the produced gcode is OK, because the simplifier software prints the segments completely with the same distances.
I changed the acceleration, feedrate, jerk with different values but the problem does not resolve.
The problem is exacerbated in some angles of rotation.
Thanks a lot for replying to me.