When they molt, they can stop laying until they are done regrowing in the feathers. They can get cranky, distant, shy, all kinds of personality changes. Molting is pretty stressful on birds.
Hello there and welcome to BYC!
Chickens don't like to be rehomed. So it is very common for them to stop laying for a few weeks. Give them time to adjust to their new home. Keep the noise and stress down, and go sit with them each day to help calm them down. Bring some goodies with you too...