I've deleted the end rails and dragged the front porch rails around, I still get this weird event. I can't find anything that changes this... it's been a long week. See the new images below.
Debra
I run into this a lot myself. As others mentioned, lowering the porch ceiling can correct this. Also, if you want the porch ceiling to remain where it is, try reducing the size of the gable sub fascia depth in the structure panel of that roof plane's d-box. I know, it shouldn't cause this but it does somehow.