It is likely your controller is worn out. The thumb sticks on the Dualshock controllers seem to go bad fast.
Similar issue on PS4.
Also had this happen on the PS4.
1) Applied bone meal to crimson fungus on crimson nylium.
2) The resulting huge fungus replaced some (but not all) of the nearby nether brick fence with nether wart block.
This seems to be resolved after deleting Minecraft from the PS4 and re-installing.