I’ll start with my own experience. When I sent my Bitcoins from the FairMillions lottery faucet to a wallet similar to Atomic Wallet (I’ve unfortunately forgotten its name), I first sent only a minimum amount, and it arrived just fine... then I sent my entire accumulated balance from the faucet, but it never arrived—because the receiving address had changed in the meantime. I didn’t know that wallets can sometimes change their deposit addresses.
Bitcoin address supposed to be changing on a good bitcoin wallet that is reputed as you are receiving bitcoin on the recent address that the wallet generated for you, but you can not lose your coins for that reason if another address has been generated as you received coins on the address. The wallet will have many addresses and all the addresses are yours. When the m wallet give you another address, you can still send coins to the old addresses.