These seem to be your Microthemer styles, but they don’t work if the ACSS body a rule is active because they are only applied to the menu, not to the links in it.
It should work if you add an “a” to the Microthemer styles.
Ok, if I disable both the ACSS and the Microthemer styles a mint green appears that you gave to the whole menu element in the style tab.
Remove the color and set your link colors in Content » Top Level Menu / Sub Level / Mobile Menu instead - then the selectors will be the right ones, and ACSS should not overwrite your links anymore