Seems not like a path order problem (i.e. whether left or right accent is considered first), but rather mismatched first nodes. Right-click on the bottom right corner of each of your quadrilaterals in this master and select Make Node First.
Glad it worked. When trying to fix paths, Glyphs chooses the bottom-most point. If there are two at the same height, it chooses the one to the left. Occasionally, as here, that guesswork messes up interpolation.
@mekkablue I am pretty sure it’s not node count as I did the counting over and over again and tried to fix the start point position also with no luck with getting it fixed
but i will re do the troubleshooting over again and try to figure it out
the odd observation is that the font file showed no compatibility issues on @etunni when he checked the source file!