The green is chlorophyll, of course.
Chlorophyll degrades with light, and heat.
If you didn't leave it out in the daylight last time you used it, I'd check the door switch on your fridge light.

THC is less sensitive to light and can handle higher temperatures than chlorophyll, so you are probably OK potency wise.
And you know how to check that, yah? :stoned::smokin:

Aloha,
Weezard