Previously, when my windshield wipers were turned on, they hit the bottom of the windshield each time they went back-and-forth (at intermittent, low, and high settings). A mechanic made an adjustment for free and they now hit the left side of the windshield each time they go back-and-forth. In addition, because of his adjustment, they don’t come to rest all the way down when I turn off the windshield wipers. The windshield wipers’ speed is consistent as they move back-and-forth. And, their speed in any of the three speed settings is the same as when they are working correctly. That is, they’re not moving faster or slower than normal in each setting. Does anyone know what might be causing this problem?