yeah in upper guk you can tell if something will give you exp if they agro you.
And to stay on topic, I have noticed the same thing in Ecommons at the level u described. Stuff going from green back to light blue, once you level to 9
even if its explainable how this actually happens it still seemed kind of weird to me when it happened the first time
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BTW i think this isn't solely an issue in those zones, just those are the places you "usually" are at on these levels