I have a survey which has a multiple choice question that is followed by an array type. The Array type has a filter to restrict sub-questions to only those that match the ones selected in the multiple choice question.
Survey is set to display question by question.

This works fine on Windows desktop, but I'm getting feedback from iOS users that the Array question is empty - ie: no sub-questions are displayed -- just the column heads (answers).

I've tested in BrowserStack and I don't see the issue -- going back as far as iOS 5 (iPhone and iPad).

Any one have an idea why iOS users might have a problem with the Array filter?