Your problem is that the crank on the end of the motor (gearbox output) shaft is incorrectly positioned.
The parking switch inside the motor ensures that it always stops at the same point - which it clearly does. The crank which converts the rotary motion from the motor to reciprocating motion for the wipers has to be positioned such that when the motor is (electrically) parked, the wipers are also at the limit of their stroke. Repositioning the crank will allow this.
If you have wiper troubles on a PSA vehicle, it's worth bearing in mind that the Valeo column switches are packed with the wrong kind of grease - which oxidises the contacts. It's an otherwise well made switch which you can take apart to clean the contacts. Re-assemble with petroleum jelly.
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