Maybe they didn't do a full flush? Should it be green or pink? I'm thinking mixing green and pink would give you the colour you have.
I bought a Schwaben coolant refill tool for my 996 and it was a joy to use. Not only did it fill without any air voids, it pressurized and found a leak that just needed the clamp tightened.
https://www.pelicanparts.com/More_Info/PEL003466SCH01.htm?pn=PEL-003466SCH01&bc=c&SVSVSI=