Hahaha iOS swipe is awful.
If you 4 finger swipe now it goes back to previous app. Do it again now it goes to the app you just left. Wait a few seconds and it's anybodies guess where it goes.
Even worse if you bring down the "notification" screen... Supposedly swiping up makes it go away, but it rarely works. Same with pulling up the app bar while in ful screen apps - that takes two swipes, and the second one has to be just so, not too fast, not too slow, and within some weird timing - try it too soon and it just doesn't respond.
Apple's swiping system is just a fucked up mess. (I use iOS all day long).