The Vampire Fleet Captain is counting towards the range limit. Slaan Fire Mage and Life Mages count towards Rare Single Entities.
I have a LM build with Mazda on Zlaq, 4 teradons, and 2 solar engines but for some reason it can't load it in QBs because it says something exceeds unit limits even though it doesn't. I have to load the build with one less solar engine and then add it in when i'm in the QB lobby and then it's playable. No idea why this is.
I'm sure there are more problems out there that I haven't spotted yet.