Maybe @tuocchu is rigth about the depth of the tray, and in my opinion it is the amount of sun it gets. remember sunflower need full sun, the more the better haha. Maybe the next time they'll come out stronger! but consider this advice!
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What about if we can grew it directly on the ground instead of seedling in the tray. Because sunflower is a big tree, its root system of course needs a large and deep space to develope the root. What do ypu think @fanyokami?
Yes! it can totally be grown directly in the soil!! just loose the ground a little bit and put the seed about 2.5 cm depth and cover with soil! I think it'll definitely do better that way!!