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That has to be some weird reaction to the plastic that bottle is made of.
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I have to concur with this. The CLP contains a solvent in it that is probably reacting with the plastic. Probably combining with air or some such, it turns green.
The question is if you can still use it. I believe it will still protect and lube but I doubt it would work as a solvent very well.
I recommend storing in lab approved containers. It would ensure that the content isn't affected in anyway.
For the record, I never had CLP or anything change color on me. I have heard of Hoppe changing color in light and it is why they come in a brown bottle.
I use a brown glass lab bottle with a eye dropper in it to store my mc2500 oil in it. Hasn't caused me any problems.