My brothers that joined my world can't go out of water they swim to the side but can' t go out, really weird

McVersion: 0.12.1 it was in Version 0.11.2 to
WorldVersion: Old (No infinite)
Device's: Samsung Galaxy S4 Mini (I, Host)
Samsung Galaxy Tab 4 (Brother 1, Joined my world)
Samsung Galaxy Tab 4 (Brother 2, Joined my world)

I dont now how to add screenshots about this, how do i show this bug? :/