Well, it wasn't Metamask's fault. Who did you send the funds to? Metamask is just a wallet. The only way you lose funds from there is you delete the wallet and without knowing your seed phrase or private key, or you send the funds to someone else.
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I was new to crypto and used same wallet on different websites including opensea. But, one day I opened the wallet and saw no balance, then transferred some funds from Binance I guess, but they appeared for a while and then disappeared.