We have a WP8.1 app which has a package version of '18.104.22.168', but when it's published to the windows store, it shows a version around '2015.X.XX.XXXX'.I don't have any clue about it, the version is also double checked in the release wizard.
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I believe that is the default store behaviour. It creates an app version according to the current date and certain other parameters. But if you install the app and see the appversion then it would be same as the one you have mentioned. https://stackoverflow.com/questions/26910934/wrong-version-number-submitted-to-windows-phone-store-is-it-possible-to-correct See this post for more help.