Scotbrew has it right. I purposely put a lid on the one that leaks to release the CO2 instead of going through the airlock. Both temps were exactly the same, yeast was from the same starter and added at the same time and aerated the same.
I just did this because of all the "I'm not getting any bubbles" threads to show that it can be something as simple as a loose lid or worn rubber grommet etc etc that can be letting your CO2 get out, but your beer is still fine.
Fermenting - Nothing.
Lagering - Nothing.
Secondary - Nothing.
Bottle-aging -Chocolate Stout, Lite Citra Ale and a Citra SmAsH.
In the Fridge - New Castle Brown Ale, Chimay and Milk Stout.