There was a similar change in a listing around me and the “possibility” SDR discusses is exactly what happened. I know the owner had a minimum he would accept- I spoke to him when it was a FSBO. He later listed with an agent with a range lower that what I know he wanted. I suspect he turned down some offers, because a few weeks later, the low end of the range was back up to the minimum he wanted.
The poor agent was holding open houses almost every weekend. Sure enough, no acceptable offers came in and the listing expired. Appears the house is now rented.