Units won't build specific structures

So I was messing around with some of the orc & naga units in warcraft 3 WE and tried to make a map that could involve them as a playable race. The way you could play them was by researching an ability the would transform your units and structures to the corresponding units and structures of the researched race(orcs to fel orcs & night elves to naga). The problem I am having is that after this research is done, the builder units won’t build specific structures (fel orc peon won’t build fel orc burrow and the murloc slave won’t build shrine of Azshara). The exact thing they appear to do is walk to the area I set for construction and just not build it. If I set them to do another task afterwards, say go get lumber, they would walk to the construction site, not build the structure, and go get get lumber as though they had built the structure. They both DO have the repair ability and aren’t based on peasants anyway. The construction process simply doesn’t begin. I KNOW both races are playable in the campaign at least once, so I don’t understand how or why they won’t build these non custom structures.