easy-c camera goes to corner when sees green light
 

I use easy-c. I have a functioning camera code that looks left, right, up and down until it finds the light. When it does find it, the set servo tracking button usually will follow the light succesfully. About 30% of the time, however, once the camera finds the light, it just goes into the upper left corner, and I have no idea why. Does anyone know how to correct this?