Actually those aren’t additive. They’re just showing you the same thing, on the CD Tab and in the Montage. The 4 seconds is what’s being displayed (and played!) in the DDP Player, which is adding in the normally hidden standard redbook 2 second pregap that you normally never see or hear. Except on the PQ sheet. Preview the CD PQ sheet on the CD tab. With default setting it’ll show that standard hidden 2 second in the Start (CD) column in any standard CD montage.
More important than any of this I think is to burn a CD from your problematic montage with Audio In Pause enabled as you had it, before deciding what to do about any of this. You should notice that the burned CD won’t have a 2 second OR a 4 second silence at the beginning. Because they’re hidden. The CD will play from Index 1, which is the position of your CD Track Start Marker in the Montage at start of music. That’s one of the things that’s deceiving about the DDP Player in it’s current state (at least until the upcoming update). In cases like this (interpreting how the Index 0’s and 1’s should be played) the Player is not playing how a CD will play in a CD Player, like it should.
I would burn a CD or demo the Hofa to see what the differences are at this point. The Hofa will audition your problematic DDP like a CD will play in a CD Player, from start of music when you click the play button. It will show the 4 second pregap, and you can go back and play the hidden pregap, but when you initially load the DDP and hit the play button it will play from start of music, like it should. Like a CD will.
When you load that DDP in the current Steinberg Player and hit play, it will play the 4 seconds silence, which is really not how it should be.
Basically your problematic montage is creating a 2 second “hidden track” before track 1. It’s how pre Track 1 hidden tracks are made. On a CD Player you would have to rewind to play that hidden track.
Edit: or you can just turn off Audio in Pause for the montage if you don’t need Audio in Pause for any of the other tracks, and it will act like a normal CD montage, with no pre track 1 hidden track. Or move everything back, to have the CD Track start marker at 0:00 in the montage.