Exterior door sill/jamb thickness

[lgswe]

I found some strange things happening when I lowered the door unit. Looking at the door in a cross section it shows the sill approx. 1/8" higher than my 3/4" finished wood floor before I did any lowering. I lowered the door 1/4" and the door dropped 1/4" below the subfloor and I lost the sill altogether. When that happened I thought I would try raising it to see what would happen. I raised the door 1/16" above zero and looking at the cross section the door raised 1/16" above the subfloor. It kept the sill this time on the outside but CA put an apron under the sill. WHAT GIVES CHIEF?!!!!! Does this happen for anyone else? This is happening for a out-swing door. I'll have to "research" a little more and see if CA behaves the same for a in-swing door. Would this be a "bug" or has CA always worked this way?