smartavionics I sliced it again with your version of Cura
and both Previews, Cura an Repetier's are the same no slicing
error.
I also imported my original GCODE (attached to my post)
back to Cura 3.6 and preview shows errors correctlly.
To summarise :
1. 3.6 sliced my model with errors which are not visible in Cura preview
when slicing
2. If we preview GCODE in other slicers error is visible in all of them
3. If we import the same GCODE back to Cura 3.6, preview shows errors
as all other slicers
We have two problems:
1. Slicing with Cura has major errors
2. We can not relay on Cura to preview the code correctly
unless we import the G Code back again