Created Unassigned: segments ends do not match exactly when using drawline [20411]

I am using the drawline primitive to segments of polylines. Somehow the end point of each segment does not exactly match the startpoint of the next segment. This is of course only visible when zooming enough but on my app (routing app) the map is often zoomed in quite deep, so the discrepancies are visible. I have looked into my code several times, and can't find where it is wrong. I have updated to the latest version (1.0.5) but the issue is still there.

Is there any way to fix this?