Weird movement when playing Mobile with PS4

I was using PS4 controller to play Minecraft on Android but something weird happen. It somehow move itself and there's a sudden sprint and slow moving. And also backwards walk can happen. Gof some reason when I press the spring button it's mess up my sprint and stop and procced sprinting and then stop again. I didn't touch any button at the time and it started sprinting itself. I
tested my controller on another game and also Minecraft for Windows 10 and it seems normal. Please fix this bug it ruined the gameplay and fun