I'm using Orbitron & WispDDE to control my Fox Delta interface and Yaesu G-5500 rotor. When a satellite I'm tracking passes over, it turns the AZ rotor but not the EL. I know it can control the EL, because if I manually point it some degrees up, it will take it back down to -3 degrees as it acquires the bird. As it tracks it, it stays at -3 degrees EL. Any ideas why it holds it flat for the duration?