Can anyone help me with this "Thomas at the Timber Yard" fault

So I got finally got myself the "Thomas at the Timber Yard" set after years of wanting one, it's complete and besides the stickers all being in the wrong places (although in the below video I don't have the lamps and fences set up on it for better visibility), it seems to be in lovely shape. Thomas and Terrance seem to be strong runners. However, despite all of this, the one Turntable on the section with the crane won't reset after Terrance uses it unless I do it manually unlike the other side. I tried using a little WD-40 and even opening it up in order to see if all the cogs were clean and not jammed with hair or other fragments, and it's all seeming to be in correct order... Can anyone offer a solution?