Jet Afterburner Behavior (Glitch?)

I don’t know what I did, but my afterburners on my space plane are acting weird. They seem to turn on and off depending on the craft’s orientation in respect to its velocity marker, which ruins the plane. Here’s a video if the link works: https://youtu.be/5TfVwB0roks
If you guys know if I’m missing something, please tell me. I’m playing on ios by the way.