yes its normal. just needs to be cleaned. mine does the same. i soak it in starsan for 1/2 hour and its sparkles like new again. more then likely there is NOT a finish on your copper and if there was it would flake off, so i wouldn't worry about it.
Yep, it happens. Make sure you clean it before using. It should stop happening after a while I think. I use a CFC and have not seen this on my chiller, but have seen it on various other copper tubing. If you clean well and dry right after it should not happen.