It sounds like you haven't updated your app version before pushing to the AppStore. Essentially the AppStore is saying you have a newer version number already uploaded - so there is a conflict. Specifically it looks like you are trying to replace 1.3.9 with 1.0.15, which is an older version.
I know that, but with DPS we can't change the version number manually for iOS. All research I've made said only adobe support can change the version number for DPS but they don't want to help me because this is an "older" version.