Multiple Destroyer Forms

I have created a set of diffrent abilities for morphing a certain unit into other units using the Destroyer Form ability. For some reason when I try it out all of the abilities turns the unit into the same other unit:

Unit X uses Destroyer Form 1: Becomes unit N
Unit Y uses Destroyer Form 2: Becomes unit N
Unit Z uses Destroyer Form 3: Becomes unit N

They are supposed to be diffrent units, the fields are correct. I think it might have something to do with the fact that they all have ability ID: sphinxform and unsphinxform, however when i replaced these with defend or bearform the result is still the same. Does any one understand what I'm doing wrong?

The orderstring field in the object editor is of purely informative nature, you can't use it to actually change a spell's orderstring (the few special abilities that have a changeable orderstring have a special field for that). Because your spells have the same orderstring they all get cast at once and the one that creates unit N happens to take priority over the others. The only way to avoid this would be to base your abilities on different base abilities, but I don't know how many have the effect you want; perhaps it'd be best to use dummy abilities in combination with chaos-morph abilities added to the units with triggers.