Gallery Sorting order

So I am confused by the way that you sort images in WordPress 3.5x (now 4.0) – I see that when you edit the gallery you can drag an image to the front of the list but that doesn’t seem to work.

Also I see that I should be able to modify this:

but that doesn’t seem to work, it works on the backend but the front end it does nothing.

if you look at this listing (realtorpress) you will see a map (image) show up as the first image I DO NOT want this and can’t seem to get the image I want to be the initial image any thoughts?

https://www.cantrellmorgan.com/listing/for-sale-office-building-1934-retaw-st-jacksonville-fl/