Heat stress and overwatering can yellow them out. :o)

Are we sure that top pic is a limelight? Maybe strawberry vanilla?

Also, the yellowing isn't going to be detrimental to your plant, it could be transplant shock, under watering, or overwatering. Give it a drink every few days or more if they are taking heavy heat/sunlight. It should grow well for you.

Nice call. 2 of them are limelights, the one you mention is indeed a strawberry one.

Don't water much unless the stems are still dropping in the morning.

I wanted to followup on this to say that thanks to your help, they are all doing fine now - not as thick as they started off, but healthy nonetheless!