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when the wipers are off make sure the driver and passenger wipers are at same level on windshield you can adjust them so they don't go off the edge or hit the bottom. if they are hitting off the edge and hitting the bottom as well you need to check the linkage since it may be worn out.
This is a common problem with Chevy Venture, Olds Silhouette, and Pontiac Montana. The mechanical wiper drive and parking cam assembly, if it's not broken, needs adjustment. The spring loaded stop arm should engage the vertical tab on the assembly mounting plate when the wiper motor reverses. See pic.
I will upload the instructions to fix this problem, if there is interest.
The problem is the cam assembly that sits on the motor shaft. It gets torqued out of position by snow or ice. When the motor reverses to park, the cam assembly should open as it is reversing, ( pin registering in top plate) and revolve with that pin being 180 degrees opposite of the slot it slides in when the wipers are wiping. On the bottom of the 3 plates, there is a spring loaded arm that will contact a stop, thus parking the wipers. One torx head screw holds the cam on; remove it; run the motor through a few cycles; hand park the wipers, reassemble with that top pin opposite of it's slot for normal operation. A small screwdriver can move the pin out of it's slot, and then you can rotate the plates to move it to position. I've had the best luck with the arm on the bottom just past its stop.