Isner also drops 250 points on July 9th. That tournament is replaced by another 150.
So, your 2620 - 100 = 2520.
Lopez drops his last 65 Davis Cup points along with the 360 from last year (again, on July 9th). The 65 is replaced by a 45.
So, your 1375 - 20 = 1355.
Thanks for that. I run a small table of the top 40 or so for my own amusement (all calculated one by one, lol, I'm not clever enough to automate anything) and though I had Isner correct, I couldn't fathom Lopez and one or two other differences. I see now it is because I don't know when DC points drop! I wish the ATP would show the DC drop dates and not just lump all the points together.