One place was ok on the interview but dealing with the HR after that was strange. Similar to OP, I had to verbally accept the offer before they would give me a

One place was ok on the interview but dealing with the HR after that was strange. Similar to OP, I had to verbally accept the offer before they would give me an offer letter. And then the offer expired in 12 hours. It felt like a high pressure sell that really turned me off the place.