This is actually very common. Standing directly in front of the machine, the bowl will lock into place to the left side at 90 degrees or to the right side at 90 degrees, BUT, only one side activates the safety device in the base unit. With the bowl off you will see a small button. The channel down the side of the bowl must be above it. When you lock the lid on, a rod is pushed down and presses that button in the base. on the ones that have 4 locking lugs in the base, you can lock down every 90', but only one position will make it work. In fact you manual says put it slightly to the left and lock it anticlockwise so the handle points at you.
1. Place the Food Processor base on a dry, level countertop with the controls facing forward. Do not plug in the unit until it is
completely assembled.
2. With the handle just to the left of center, place the work bowl on
the base, fitting the center opening over the power shaft.
3. Grasp the work bowl handle and turn the bowl to the right until it
locks into position.
https://www.manualslib.com/manual/605011/Kitchenaid-5kfpm770.html?page=7#manual
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