I'm not sure what is happening, what is supposed to happen and all that, since I am pretty confused (just like last time when I tried to help you fix some things in that map)
I get close to Blood Forge with Paladin and I could morph him into Bassal Golem. It changed into metapod, which was visible and couldn't move, and after few seconds it did change into Bassal golem.
As I accidentally found out from that, you can change units by getting close to some structures, so I went with basal golem to another structure and I could change it into warrior and all worked well.
I couldn't change it into paladin or hunter since I didn't have those upgrades
Is this even close to what you are talking about? D: