Well, 12,304 kg ≈︎ 27,126 lb, 1 ton = 20 cwt = 160 st = 2,240 lb, ∴︎ 12,304 kg = 12.11 tons.
It would be inconsistent to use tonnes in that table, because every other example gives Imperial. Therefore it's their conversion which is incorrect. Given that the figures probably came from the...