First of all, kudos to you for beta testing your app before marketing it. Usually beta testing iOS apps is done by releasing the app to Apple Testflight (iOS app store exclusively meant for various levels of app testing before relasing it to the main app store).

Coming to the bug you're facing - I have only built native Android apps, but I guess this idea holds good for iOS too. Assuming yours is a native iOS app, usually these things happen when the app uses advances UI widgets that are unsupported in OS versions below a certain version.

To validate this hypothesis, check the iOS versions of the apps of all your friends. Then, check if the issue persists on phones of a particular version and below. If that is the case, then you can solve it in 2 ways:

1. (Preferred only if buggy UI is on older iOS versions) Make your app available to only phones with iOS versions equal to or above the version number where the UI widgets work properly.
2. (If recent versions also have the bug) Fix your app to use stable UI (non-latest) widgets supported by most phones.

Sometimes it's possible your app is using stable UI widgets and still recent iOS versions have this bug. In that case, you will have to go through the hard route of trial and error on multiple phones (ideally 3 having a mix of buggy and non buggy versions of your app) with different iOS versions.

Hope this helps!

Staff Software Engineer at Series A startup

Adi Pratheek

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