@Shannon789
Are you searching while logged out? If not, you may be seeing skewed results. Sometimes you even have to clear your cookies/browsing history to see the results the way a guest would. Give that a go and see what happens. You could also check your views under the 'insights/conversion' tab to see if they are up or down.
As to the change of the main photo, are you seeing this when searching with the new categories setting or seeing it if you search the traditional way? It was my understanding that Airbnb is only showing a different lead photo (and even a different listing title) when using one of the category searches. It's supposed to select a photo appropriate to that particular category but doesn't seem to work very well. For example, I noticed when searching the shared homes category that, more often than not, it would show a photo of a living space rather than the bedroom, even though in many cases, the photo was really not selling the listing well. I can see how this would really affect your bookings if guests aren't seeing your main selling point.
However, none of this is supposed to happen if you search without categories.