The problem of ghost lights remaining after the fire has gone is well-known for /lightning/, but I have seen it for other fires too. I had a big fire in a jungle and now that area is riddled with phantom light sources. This fire burned for many game days and I generally stayed out of the area until it had practically all burned out because of horrendous lag it caused, but it obviously gave many, many chances for this bug to manifest.
Caveat: While the fire finally finished burning its last few blocks in release 13w05b, the sites of the phantom lighting that still remain may be from while I was running earlier releases. Possibly months earlier, because I have no idea how long it's been since I last visited this part of the world.
(If you have an old world like mine, are there any established ways to force it to update a large area to catch glitches like these, or is the game engine supposed to do it automatically?)
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I've seen this kind of bug before but with lava, and before this snapshot. The only way I fixed it was put a block over the "source" and it'd go away, but the moment the block I placed is removed, it is back. Try placing dirt around the area(s) and see if that helps, that is the only solution I can think of, or maybe try restarting your game or reloading the world?
I can sometimes clear individual glitches by forcing a block update nearby. But most of them originate from points in space where leaf blocks used to be, so there's no visual hint as to their precise location, making building over them a real chore. And given the sheer number of glitches, clearing them all up would be thoroughly impractical. I'm hoping there is (or will be) some way of prodding the game engine to clear up at least a chunk at a time, otherwise I'm stuck with them for the foreseeable future.
I haven't had any /new/ lighting glitches, but if there's a way to trigger bulk updates throughout a region and clear the old ones, that would be wonderful!
I found that, for some reason, filling up the area with the Ghost Lighting with leaves and letting the leaves decay make the lighting go away. I have no idea why it works but it's a good way to remove it.
Sadly, you can only place decaying leaves with commands, so if you want to remove it on, say, a survival world, you're out of luck.
This glitch still hasn't been fixed and I have yet to know what causes it.
Fry
Attachment - lightingbug.png
World version 13w05b, and this is part of the aftermath of an enormous jungle fire. Many areas have spurious light sources.