I Had Fable 5.1 and 5 Build Me the Same App

So, I just had Fable 5.1 and Fable 5 build me the exact same app, and it wasn't even close. Not only did these apps look and feel very different, but one cost me 1,200 bucks, and one cost me 500 bucks. One worked for a day and a half, one worked for just half