I did my research on those and asked him and he said that they used the wrong form “by mistake”
Then it is his mistake. Any increases in cost may end up being his responsibility. Don’t sign anything new at this point. If it was the wrong forms, it may stop the transfer.
He also tried to discourage me from having a home inspection. I want to back out of the deal.
Make the home inspection a pre-requisite. Did you sign anything directly waiving the home inspection? (hope not). Things found during the home inspection can end the sale/purchase.
Now he says that the seller won’t sign the cancellation of contract document unless I sign an exclusive representation agreement with him.
This is strange and questionable, maybe even illegal. Sounds like the seller and the agent may be related or the same person. Which contract document is this? Do you have a form title/description?
I would think that he is legally required to send all communication about my deal to me.