You could be tied up into the conflict should the sale somehow go through. Yes, a title search is almost always required, at least if you are going to hold a mortgage on it. But it may have been a family issue, a death, an unlawful or contested sale that was never remedied, who knows.

I would no walk totally away from it, I would just back off until you and your lender are satisfied that the 'issue' is resolved and not going to come back to haunt you.

I owned a small house and had the abstract that went all the way back to when James Madison first divided up the state to be settled. There was some minor flaw somewhere down the line 150 years back that always bolloxed up a new mortgage. Some people who bought got into it and had trouble convincing the lender to look past it, many a purchase was cancelled because of it and I heard of a few fights between private sellers and buyers about returning the money they put down on it. I bought the place from my parents who paid cash for it. I gave it no concern as it was like 150 years prior. When I eventually sold the buyers bank screamed bloody murder. By then enough homes had traded hands in recent years for people 'in the know' to know what to say to the bank. It got cleared up.

Just be careful. Mine was a $25,000 deal, I suspect yours is many, many times more than that, it's an awful thing to get hung up in real estate transactions that hit a snag.