I'm not sure what you mean with conflicting. 
The icon text has its intended color. It's the same highlight color as everywhere else with the maia themes. With the regular Adwaita theme the icon text highlight for me is not white but blue:
regular Adwaita

Adwaita-Manjaro

The background problem looks more like one of those gsettings things ... Your're using Gnome, aren't you?
Yup, Gnome.
By conflicting I mean that the Adwaita-Manjaro "highlight" colour should be green instead of blue, right? But for some reason the blue "shines" through. You can see it on these images in my post. These screenshots are taken on the same system. As you can see, on the second image, the highlight colour is green and blue at the same time.
https://forum.manjaro.org/index.php?topic=33377.msg273849#msg273849Not a major issue of course, I just use the regular Adwaita then, but would prefer the green highlight instead of blue - would make it look more "Manjaro" haha

And also, the black/grey icon text on desktop makes it difficult to read on darker backgrounds. This "bug" doesn't appear on the regular Adwaita.
Who is responsible for the Adwaita-Manjaro theme development on Gnome? Maybe I should contact that person? Maybe it's my systems issue, but it occurs on 2 of my computers, one of them is a fresh install.