Autojump happening on 2+ high blocks

Auto jump is activating whenever I get close to a stack of 2 or more solid blocks even though I can't jump onto the stack. Especially annoying in hallways if I'm near one side or the other.

Only happens if open air above. Does not happen if I'm in a 1 wide by 2 tall tunnel but if I move to 3 tall area I begin jumping.