X1 When Raise Roof, Plate Ht. Changes??

[Zowie]

So I built my roof without checking "Trusses no Birds Mouth", Now I want to get rid of the Birds Mouth. I thought I just needed to raise roof by the amount of the birds mouth, but I notice when I do that and look in the Roof DBX it says my top plate ht is higher and my birds mouth still reads 1.3/4 just like it was.

I recall in past versions when you raised the roof by the bird's mouth, the birds mouth went away.

Any hints about this? I'd rebuild my roof, but I did a bunch of editing. T

Thanks,
Zowie