Cat D11-bulldozer (42131) control+ test your build step 3 rotation direction. App says clockwise, mine is counter-clockwise. Other side rotates clockwise. Should mine rotate clockwise as pictured in app, and is it
LEGO Technic: App-Controlled Cat D11 Bulldozer Set (42131) Toys - Zavvi US
First look at the LEGO Technic 42131 CAT D11 Bulldozer! - Jay's Brick Blog