Do mature and independent people revert back to being immature when they move back in with their parents?

I have no problem with people who choose to live with family. There are many reasons for this. I’m just baffled by someone I know who moved to another country, was fairly independent and mature and now that he has moved back home with family has slipped back into his old ways. What is it that causes this?
Do mature and independent people revert back to being immature when they move back in with their parents?
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