weird unit fatality

[Drain Pipe]

i made a trigger to replace a locust type unit with a regular unit and it seemed to work fine until i made upgrades for that unit, regarding life, attack and defense. After the upgrades were learnt, the units would die upon being replaced. I don't know why please someone help.

 

[qwerty]

you mean you want the locust(crypt lord) ability, but change the locust model?

 

[Drain Pipe]

No i made units that had a locust ability and i made a trigger that when they went close enough to another unit, it replaced them with a copy who had the same everything, just one whom i could control and select.