It has to do with the amount of impurities in the water. Water which has been heated tends to have less dissolved gas, particularly chlorine if you have city water. With less dissolved gas or other impurities, the water will freeze at a slightly higher temperature. That's why salt is used to melt ice...a strong salt solution may not freeze until somewhere below 0.
Therefore, water which has been heated will typically freeze at a slightly higher temperature than water from the same source which has not been heated.
Try this will distilled water, and I'll bet the cold water will start to freeze first, simply because the hot water has to cool off before it can start to freeze.
Never ceases to amaze me what sort of nonsense & mis-information people like teachers can come up with.
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