Newbie - Outdoor Grow, Plants growing only 2 leaf sets?

I have some plants outside (bag seeds) in addition to my Aerogarden. The Aerogarden is doing fantastic! The outside plants don't look quite right. They are only growing leaf sets of two. Each plant has two or three leaf set of two but no more than that and no signs of sprouting leaf sets of three at this point.

Has anyone ever heard of this before? These seeds came out of the same bag as the ones in my Aerogarden and those plants are a almost two weeks old and close to 3 inches tall now.

I tried attaching pics. Not sure how y'all get them to show up in the post like you do.

Later
Chaos