It's been about 13 days now by my count and I'm a little perplexed by one of these eggs!

5 of them are still doing great, still firm, leathery, etc.. One on top is a little sunk in but still candles red, veins look healthy, etc.. but one on the bottom is a bit more....for lack of a better term, "wet" looking all over the egg rather than just a "window" and is very soft compared to the others. it still seems (key word there) to candle redish and appears to have healthy veins but the shell just concerns me.

For you EXPERIENCED breeders, is this a sign of an egg on it's way out?