Once I entered the nether the D-pad moves me down right very slightly despite me not pressing anything, I also am no longer able to move other than that direction. When I left the world and rejoined it still did that. The only way I found to fix it was to use one of the two joystick modes. The attached video shows the problem better than I can explain it.
MCPE-225433
Once I entered the nether the D-pad moves me down right very slightly despite me not pressing anything
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this is called stick drift cleaning the inside of the controller or getting a replacement will fix this issue. this is not a problem on mojangs end