not seated in the top(inner) bracket. If you are seated correctly, the holes that the safety pin sit in are lined up
This is correct. The top step has three positions. They take some getting used to, to locate them. I pull the steps out, then go to the top step. Lift the lever with one hand, and adjust the top step till the lever can move down easily and "clunks" into one of positions I want it to be (top, middle or bottom). When it seats, the lever should be all the way down and the holes line up for the bail pin. If they don't, the top step is not secure, and still needs to move to the correct setting. Sometimes this takes about 15-30 seconds to get it right. The more often you deploy the steps, the more intuitive this becomes.
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