Oberread is just a re-distributor. Hardly the most accurate source for their information, especially since they just converted the original manufacturer's metric data into US format.
When in doubt, talk to the manufacturer directly, which is exactly what I did.
Follow the links I provided above to the German parent company site who actually make the pumps. The 12V pump is indeed 1400LPH (~6.16GPM).
The oberread site has probably gotten the specs for the 12 and 24V models mixed up.
As for "hard to believe for 12V at 24V", it's not uncommon for DC pump manufacturers will use 24V rated wiring in the motors, and then rework the pump to run in 12V mode as well. This is less work for them to do this, and it often gives the 12V model a longer life-span. I was chatting to a Shurflo pump engineer about this while we were discussing MTBF's for various motors. He told me of the various continuously-rated motor models that they built, that while rated at 12V, were internally built to handle 24V power, and these were the more desirable motors to get a hold of.
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