I am looking at changing my reservation and on the change screen, looking at new hotels, even though I have checked the "Show available only" I am seeing hotels that state "Hotel is unavailable." When I look at the days listed at the bottom of the hotel entry they are showing in white, indicating they are available.

What's the deal?

Update: I have tested in different browsers (Edge and Chrome)

Click the SEARCH button UNDER your existing room to refresh the list.   (To the right)

Hope that did it. 

That cleared out the hotel from the list. Not sure why it showed with individual days available but not for the entire length of the stay..