Did you harden your plants off?
When moving from indoors (even inside a nursery) to outdoors you have to slowly introduce them or you will shock them.
And after harden and planting they still take a little time. They put all their effort into establishing the roots first then they start to grow bigger...
I know I read to do that ...may have read that after I planted the Toms & Peppers. Planted so many things I can't say. I look forward to seeing what happens next year.
Thanks for the advice!