I think they were initially sunburned because they were not used to / acclimated to the full sun. They are also prone to transplant shock when roots are disturbed or if they had become too big in small containers. They should be OK once they settle in and new leaves begin to grow -- has it been a week?
For future reference, be sure to water them well and fill the planting holes with water just before transplanting, slip out of the container making minimum contact with the roots (try to hold the dirtball rather than the bare roots) and plop in the watered hole, fill half way with soil and fill the hole with water again, then mound up the soil to just below the lowest pair of true leaves (bury the seedleaves).
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