The most likely cause of the "out of gas" failed transactions(zombieClub token)

Few days ago , a NFT public sale caused a lot of "out of gas" failed transactions
(contract address:

The official says it is because the out of date version of user's metaMask wallet or it is because users set lower gas limit, they don't admit anything wrong with their smart contract.

But I don't think so.

Could somebody find out the real cause of the "out of gas" failed transactions of their smart contract?

Hi @Evan_ACan,

I went to Etherscan to see if I could look through the smart contract, but it looks like the contract has not been verified on Etherscan, so unfortunately I'm not able to view the source code at the address you posted.

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