Asus really needs to wake up to these small issues since A9 or earlier. After applying themes, some toggle buttons especially in the battery section and the entire Powermaster settings does not take the theme colors. Am not sure what's the big deal in solving these issues. I have been experiencing the same since A9. I have heard that such issues are also present on the Zenefone series.
On another note, accent color is a default option in A10, but ROG 2 users are yet to get this feature. Now with ROG 3 launch it will soon be forgotten. Sad state of affairs here.
😞