Should not have been a glitch. Most likely the servo failed hard over? Is there enough left of the elevator servo to find out? Having said that it should not have been a glitch, years ago, I had one of the early Futaba 8UAPs go hard over on everything while flying (luckily not a jet) with a PCM receiver with fail safes set to straight & level. Never found out what it was. Most likely an internal receiver fault. I should have learned right then & there to dump Futaba, but I'm dense. It took me several more wrecked airplanes and several 9ZAP WCII failures to wake up!