PTR was not highlighted. I have tested the BOTH1 option now. Works just like the non-highlighted setting. Direct hit on target.
EDIT: Same Issue again. This time with an underground facility. But when doing the harbour training mission everything hits.
I assume something inside BMS messes up if you switch to your desktop too often 😄 After restarting BMS everything was just fine.
So there might be something that got messed because I did everything as usual (and could bomb any bridge or factory successfully) yet bombs fell short during the mission 😄