2001 Pontiac Montana windshield wipers.?

My windshield wipers are stuck in the upright position on my 2001 Pontiac Montana and they wont return to the right position. They work fine when I'm using them, but when I turn them off they return to the upright position. I took out the fuse, and that is not the problem. Any ideas on why they would stay that way and any suggestions as to how to fix it would be great.
 
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