PopUps keep reappearing on iOS

I'm using the PopUp Pro plugin to show popups on a website. There seem to be som issue with iOS (iPhone and iPad), where the popups keep appearing when reloading the page, even though the "Never see this message again"-setting is selected. I also tried to add the "PopUp shown less than"-condition, but no difference. It seem to be working fine on desktop Safari and Chrome, where popups only appear on first occasion.