Basically, when I walk in any direction or just straight, and then let go of the keys to stop the movement, my player will continue on walking even with me not pressing any buttons until I back it up or something. Same thing when I jump, if I just jump more than once, then my player will continue jumping until I back up. 

Like I'm not pressing the inventory button and walking at the same time, or anything like that. I just walk or jump and It will repeat itself until I press the "S" key. And by the way, my game is up to date. It started yesterday, and it has never done that before like ever in my whole time playing Minecraft.