ERC721 minting cost discrepancies

I have very basic minting function that I have stripped down to the bare essentials in an effort to drastically lower minting costs:

function calculatePrice(uint256 c) private pure returns (uint256) {
    if (c < 10) {
        return 10000000000000000;
    } else if (c < 20) {
        return 15000000000000000;
    } else if (c < 30) {
        return 20000000000000000;
    } else if (c < 40) {
        return 30000000000000000;
    } else if (c < 50) {
        return 40000000000000000;
    } else if (c < 60) {
        return 60000000000000000;
    } else if (c < 70) {
        return 80000000000000000;
    } else if (c < 80) {
        return 100000000000000000;
    } else if (c < 90) {
        return 200000000000000000;
    } else {
        return 400000000000000000;
    }
}

// We should include price/generation changes in the pricing check but we are not greedy. If someone is lucky
// enough to bridge a generation with their multi-purchase, let them have the discount :)
function adopt(uint256 n) public payable {
    require( n > 0 && n < 21, "You can adopt a minimum 1, maximum 20 Fati");

    uint256 c = totalSupply();
    require( c < 101, "Sale has already ended");
    require( c + n < 101,  "Exceeds maximum Fati supply.");
    require( msg.value >= calculatePrice(c) * n, "Oh No. Amount of Ether sent is not correct.");

    for(uint256 i = 1; i <= n; i++){
        _safeMint(msg.sender, c + i);
    }
}

When testing my minting function with hardhat I can see that my minting cost is very close to a bare-bones mint:

function bare_adopt() public payable {
    _safeMint(msg.sender, totalSupply());
}

You can see the values here:
image

But when I try to mint on Rinkeby I see this value:
image

What is going on here?

Hi, I am not sure for this, maybe you can ask help from

Thanks, Ill poke a few ppl over there :slight_smile: