Huh… interesting… Did you try pressing the APP button a lot earlier… I usually press mine when the ILS signal is detected, and I don’t need to wait until I’m lined up before I press it. I leave the APP to be armed and activates itself automatically when it’s captured. You’re also a bit high on the glideslope, which is usually too late to engage it. That’s why I prefer to arm it earlier before crossing the localiser and make sure I’m already below the glideslope, not above it.
Also, try to do a basic housekeeping first which is usually the cause of 90% of the problems:
- Set Flight Model to modern, not legacy.
- Assists settings should be set to Hard/True to Life.
- AI Copilot control should be off.
- Add deadzones to all your axis controls. 5% or more should be enough.
If you confirm these four are correct and it’s still having the issue. Then there’s definitely something else going on. What mods do you have? Any of them affecting autopilot or flight dynamics? Doesn’t have to be 787 mods, it could be something else that might have affected it.