It sounds like your garage door sensors might be out of alignment. To fix this, you'll need to adjust the alignment of the sensors. Here's how to do it: 1. Open your garage door and locate the sensor on each side of the door. There are often two screws on top that you can loosen to adjust the sensor's alignment. 2. Carefully loosen each screw until you can move the sensor into better alignment. Be sure to tighten the screws back up once you've adjusted the sensor's position. 3. Test your garage door to see if it now opens and closes correctly. If not, repeat these steps until it does.