I've found that the ATH library behaves differently on iOS and Android. Also, AppStudio doesn't expose a variety of ATH's optional parameters that allow for customized behavior. If you want to not use the ATH library built into AppStudio and instead use the ATH library directly from the source, you can experiment and set it up on your own. That's been working well for me.
You'll find more info at http://cubiq.org/add-to-home-screen. On a side note, it appears ATH isn't being actively updated by the author.