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Check the new starter switch's manufacturer's name.
If all of them were newly manufactured by "Vintique" .... that is the "only" problem.
"Vintique" have been manufacturing these "poorly" designed and "poor" quality reproduction starter switches for years; however, because of short supply of well made original starter switches, Model A owners have no choice but to buy these beautiful malfunctioning "look alikes" and rework and enlarge the plunger hole in the top of the body with a "Dremel" tool to allow the plunger to line up with the angle of the starter rod above.
If this hole enlargement procedure is not performed, the plunger gets jammed downward, does not pop back up, and the starter continues to engage and rotate after the engine is running.
Under "Search" above, one can find same types of starter switch problems which could fill volumes of stories on the non-ferrous starter switch's flat bar becoming welded to the non-ferrous starter button on top of the starter.
Hope this helps ..... after this starter switch metal plastic surgery procedure, all is well.