this has happened to me a few times now, and I still don't know what's wrong. After shutting off my engines, the engine power increases back to %100 as if I had a planned burn activated, and won't turn off. After going into the pause menu to report this bug and then returning to the game the issue went away, but this problem is still a bit annoying. The screenshot doesn't show anything on this problem. I wish I could provide steps to replicate this issue, but I don't know at this time how to trigger this bug.
Did you have a planned burn with auto-burn enabled?