When going up 1 block high steps with carpet on top, it doesn't automatically jump for you.
MCPE-6854
Auto jump not working with carpet
Resolved
Fixed
0
(Unassigned)
Confirmed
Tablet - Android - Other (Specify in description)
0.8.1, 0.10.4, 0.10.5, 0.11.0, 0.11.0 Beta 5, 0.11.1
0.12.1 Pre-release
Retrieved
I think the carpet block counts as a whole block, so the game thinks it is 2 blocks stacked on top of one another, therefore not auto-jumping you.