So I've done three batches of beer so far, using the same recipe for all so that I could try to get used to my equipment/system without too many variables. But, something unexpected happened with my second batch in the keg, it darkened considerable over the first two days. IT was a light golden colour and was becoming clearer as I poured it, but then it suddenly darkened and became cloudy. I've been trying to figure out what happened but I can't find anything that would cause this to happen. The recipe is a British ale that had an OG of 1.038 and a FG of 1.014, it was supposed to be OG of 1.042 and a FG of 1.012. I've checked the seals on my keg and CO2 system and there were no leaks, does anybody have an ideas about what could have happened? Thanks!