The chart is about how they feel towards each other, not what relationship they’re in! I should have specified, haha. Here’s what’s going on:
Marinette (and consequently also ladybug) is flush for adrien but pale for chat noir. Adrien (and consequently also chat noir) is flush for ladybug but has an ash crush on marinette (and chloe, but she’s not in the lovesquare so she doesn’t get to be in my diagram.)
theres not a huge amount of precedent in homestuck canon for what an ash relationship looks like, or how you even have an ash crush, like so i’m taking some liberties… and twisting things to root adrien’s ash feelings in caring about chloe and marinette rather than being annoyed at them.
maybe he’s a little annoyed. Chloe is his oldest friend and he knows she can be too much, but she’s also capable of being better, and deserves kindness. Marinette is incredible but when she lets chloe get under her skin she can be so sharp. he wants to give them a good talking to, but romantically. and make sure they are nice to each other, on a candle-lit date. He wants to put them in the get-along shirt when they are to mean, and make them appreciate the good qualities he can see in them.