Hello Zengirl,How far post-op from your recent surgery are you? If it's more than about 2 weeks, the heat you are experiencing may be a warning sign.
There is no way to know if the scar tissue your knee developed post-ACLr was because of the misplaced graft or the result of an immune system response. If you are having significant heat beyond a certain point, it could be that your body is having a strong reaction to your recent procedure.
Please take a look at Dr. Noyes tutorial on arthrofibrosis, he mentions the warning signs to be aware of.
Has your OS taken x-rays to look at the tunnel placement? It's mentioned in some of the articles on motion loss after ligament injury. I think it even has photos comparing what a properly placed graft should look like. At least it might answer that part of the puzzle for you.
I really do understand what it's like to feel like you've been betrayed by your OS, my knee issues had a similar beginning although it didn't involve a misplaced graft.