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Last year I bought 15 muscovy ducks from JM Hatchery, and raised out 13. There were two deaths within a couple hours of arrival after their two day trip.
From viewing your picture of your brooding pen, I get the impression that your heat lamp was directly in the middle with very little area left for the ducks escape to and cool down. Furthermore, due to the red tinge of the heat lamp, I am assuming it was a 250 Watt bulb. With infrared heat, you could have very well baked their brains, which would explain the seizures. In close quarters like that I put the lamp over to one end which allows them a place to go if it gets too hot, and use a 125 watt bulb.
edited head to heat