I would take off a good one and compare to a bad one. I'm sure it doesn't take but a little tiny bit to change that angle a lot. Could also be some extra material in the groove of the post causing the issue.
On mine the hole is definitely drilled in the wrong place on the step. Causes it to not open all the way.
Also have this going on on one of the 8 standoffs. Quick fix with a file, but still.
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