This is a bug i found in Minecraft creative mode on a super flat world but I am not sure about survival mode. I was testing something and i partially blew up a village when i noticed that on the sides of the farms, there were some water sources except they weren't sources. the water went half way up a block and it spilled only 3 blocks unlike the usual 7 blocks. I am not sure whether this is deliberate because lava can sometimes do this or just bug.
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Confirmed.
Still a problem in 1.6.1

Duplicate of MC-11280, please use the search function to see if your bug has already been submitted. Currently over 58% of tickets are being closed as duplicate.