Nova skill problem

[ronojales]

hello!

i tried making a spell, where a unit is doomed. and when the doomed unit dies it will release a poison nova that poisons every unit the nova touches.

i created a dummy poison nova unit to serve as the image for the nova, and when the doomed unit dies it will create 8 of the dummy units on the location of the doomed unit and will move in 8 directions.
my problem is, instead of the expected 8-direction nova effect, the dummy poison nova units goes like this



and not the ring effect. anyway to fix this? the collision of the dummy poison nova unit is set to 0.

EDIT: created an image at Paint