Just trying to help.
And you may indeed find something via your ticket.
But just in case.
You started at 1390. You jumped into a squad with an Onyx player a couple of hundred points above you. We know that tends to diverge the rank gains. And I assume that if it wasn’t a glitch - this is the main reason your CSR didn’t behave as expected.
And I don’t know for sure, but I think the main problem in this situation is that the higher ranked player takes all the kills, leaving you always “below expected” (which is calculated from your past history vs that MMR) and that drives your MMR down.
Let’s assume you started off with an MMR below your CSR - which is the main reason someone for a low CSR gain.
Game 1 you went 7 & 17 and your fellow D4 went 18 & 19. So even though CSR doesn’t look at personal performance you probably pushed your MMR further down on this game. It also looked like the game was stacked in your favour.
Game 2 you went 13 & 16. Your fellow D4 went 28 & 11. Again, it looks like you underperformed. MMR now even lower than your CSR. Which makes it even harder for your CSR to go up.
Game 3 you did much better. 34 & 22. Your reference buddy only went 30 & 33. So you may have done some repair to your sagging MMR. But I don’t know how good your opponents were. They all went negative and your Onyx pal went 57 & 22.
Game 4 was a -yoink-. One of their players quit before the game started. And the rest soon after. Nothing to see here.
Game 5 you did Ok. Broke even at 11 & 11. Your D3 buddy had a day out 16 & 6. But your Onyx pal did all the work 34 & 7 (which means you probably didn’t hit expected kills and deaths). It was over 200:44 so again, maybe not high level opponents.
Game 6 you went solo and started to express yourself 19 & 5. The start, hopefully of climbing away from 1390!
But your MMR is probably still low. It will take a few wins to get it close enough to your CSR to start earning points again.
So again, good luck with your ticket. I agree that the CSR not moving at all for five or six games is unusual. But actually looking at your scores vs your team mates I’m not sure you really did a lot to move it much anyway. You only went positive in one game while your team mates seemed to do it more often. You had an Onyx player taking all the kills.
This won’t get your MMR above your CSR. And that is the main thing stopping your CSR going up. That plus some some rounding down of integers left you “treading water”.