Whenever you put a powered repeater facing the side of another repeater its texture goes a little weird but it probably works okay
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This isn't a bug. It's a repeater lock, very useful thing: http://www.minecraftwiki.net/wiki/Redstone_Repeater#The_Latch
20th Duplicate of MC-4449, please use the search function to see if your bug has already been submitted. Currently over 58% of tickets are being resolved as duplicate.