I had the exact same problem on a new Sealand Porcelin toilet that I recently installed. The problem was that the ball seal was not centered on the bowl. If you look down in the toilet, you can tell if the seal is centered or not. You should see the same amount of seal exposure around the entire circumference. This seal is a LOT different than the non porcelin toilets, and does not ride in a channel of any sort. If you remove the strap that supports the bowl to the base, you can lift the bowl and re-center the seal. Takes a couple of tries to get it perfect, but I have not had a problem since!
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