Im reasonably certain the conditions are the same for everyone, which is tournament greens, and as a pro to tour pro you just came off of fast greens. My best guess is in your fist round your starter irons (which are very inconsistent) just happened to be putting you in better spots on the greens, making the putts more manageable. The next round, if you kept getting bad spots on the green, I can understand why the tournament speed greens would cause so much trouble, and possibly destroy your score.
Granted Im only guessing, but if OP gives us a little more info, we may be able to zone in on what happened, but as far as conditions, like I said, I think everyone is in the same boat.