The advanced responsive seems to set a fix height for the collection widget in ios safari (ios 12.3), so the content of collection display with a scroll bar.
If use the windows PC client with Chrome or use the responsive mashup instead of advanced responsive, then the problem won't occurs. It seems the problem only occurs with advance responsive + ios safari .
Can you please provide some screenshots of the behavior under both safari and Chrome? We'll have to research this one but it would help to have as much information as possible.
