Metamask Invalid Amount error

I’m developing a game. And I’m trying to transfer a sample token that I’ve created in Remix (ERC20) on the Rinkeby testnet.

Once the transfer function executes a drawer opens in my Metamask app (iOS) and shows the transaction details but says "Invalid Amount".

From the Remix editor, I can transfer with no problem between my two demo accounts.

a photo of the problem

Metamask Invalid Amount error

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