I don’t know much about the physics involved with subsurface engraving, but the glass used seems to make a big difference.
As discovered by @cloxart in this thread Omni X crystal engraving inside a sphere? - #24 by cloxart
So the Lines engraved inside, and the Fill Sub-Layer went through the crystal engraved on the business card?
This is odd. I’m asuming, you didn’t change the focus. Can you confirm that?
Both the Fill and Line Sub-Layers appear to use the same intensity settings.
Does it make a difference if you create a new separate Layer in fill mode?