When you have Redstone torches like in this setup here, only a few of them blink. In another world only the last of them blinked, so it seems to happen only in specific locations of the world.
A quick but bad fix for this is setting different delay in front of the torches, so they don't activate the same time.
Maybe there are more affected versions, I only tested these two.
(With all this i mean the torches on top of the blocks, not those on the side of the blocks..)