Invalid TP1

Good afternoon, I hope you can help.
3years ago I bought a freehold new build house that had a estate management charge. We also have a double carport that is a separate semi detached building. We have recently received a bill for maintenance and insurance of our carport, and it turns out that the developer solicitor registered a completely different version of the TP1  to the one that we have signed along with different plans (that originally and without any doubt showed it as a part of our freehold  property- our solicitor has confirmed this). As a resolution has not been agreed yet, and the TP1 each party has signed does not match the other it is clearly invalid. 
my question is this, can we be held legally accountable for any covenants or maintenance charges in either copy of the TP1?
many thanks

Good afternoon Ian - You would need to speak to your solicitor or legal advisor to check if you can be legally accountable.  We are registration body and do not have any involvement in issues like enforcement of covenants, etc.  

Okay many thanks for taking the time to reply