This is because Coingecko is not taking into account the unvested REL yet. REL belonging to the sREL contract is not currently part of the circulating supply. [https://etherscan.io/address/0x175840F5A4CE0bD99e1f27D01b0a1D18759DFF2b](https://etherscan.io/address/0x175840F5A4CE0bD99e1f27D01b0a1D18759DFF2b)
We'll be reaching out to them to help the calculate the circulating supply correctly.