Just about the only thing I can think of is a sticking solenoid or one that has an internal wiring fault. Assuming it worked when first installed, the most likely thing is that the plunger is stuck due to rust, and while the attraction of the magnet is enough to move it in one direction, the spring is not strong enough to move it back. The other possibility is a broken spring.
Try disconnecting the wire from the solenoid to the starter to confirm that it is the solenoid sticking.
I would be inclined to take the starter back to whoever reconditioned it, although if it was too long ago, to a different auto electrician!
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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