There was a known issue with the previous release specifically with iPhones, but that should be gone with the most recent one (4.20.5). However I have actually managed to find a different issue – which mainly appears when there is a text beneath the results list, and only sometimes happens on android phones.
Apple’s Safari is generally much worse to debug, in many cases it behaves much worse as the other webkit browsers, which causes a lot of issues when trying to get the event handling right. Hopefully I have indentified this problem correctly, I will try to push an update later today to address that.