My orangie, Chestnut, constantly has leaky eyes, they get kind of dark and wet on the inner corners. It shows up a LOT due to his coloring. He's been like this for years; often ask the vet, different vets different years. They all say it is normal for him!

Just keep a watch on it and see if maybe the kitty just has a little cold that it can fight off in a day or 2 or 3.