When in the minecraft store I made a mistake and deleated worlds I downloaded from the minecraft store, I dont see anywhere to re-download it, and it said update on a world I downloaded from the minecraft store, I tapped update and it wouldent do anything. Also when I try to kneel down and swim in 1 block of water it now won't let me, tho I can then swim really fast standing up on 1 block of water, I have to get now within 2 blocks of water to dive i to the water.