For some reason, the second layer of my mob farm is really bright, as if torches are placed all around it. There are no torches or holes that would let light come into my mob farm. Does anyone know a solution for this bug/problem? Here are some pictures:
Rollback Post to RevisionRollBack
System.out.println("Test successful, " + ∞/0 + " is not infinity");
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There was just a thread like this recently describing the exact same issue; the problem is the game failing to properly update light levels, probably related to this bug (if you press F3 the game will show that "sl" (sky light) is nonzero). I've also seen this in floating strongholds in Superflat worlds (I modified them so they always generate walls, so should be dark inside but aren't; not an issue in a normal world as they are underground) and in caves where water flowed over lava, leaving light behind (in this case it is block light that is the problem).
That said, one way to quickly fix this is to use MCEdit to relight chunks (if you have a large world just select the ones with your mob farm), which will update the light levels to the proper values (also gets rid of the black spots bug, which is likely just the same bug). It can also spontaneously resolve by itself; quitting and reloading the world may fix it.