Maybe is how you're using it: just make sure that you're using the Manual Cycle correctly, be sure to push "clear" button before you add a new ingredient.
Is the kneading blade correct in place? Does it turn when he machine is empty and you switcht it on?
See page 3 of the manual. You can find it with the link below:
https://www.manualslib.com/manual/534904/Welbilt-Baker-S-Select-Abm6200.html?page=3#manual