Contract call function works on testnet but doesn't work on mainnet on bsc chain

Question

The call function for getTokensForUSD works perfectly on testnet and hardforks but doesn't work on mainnet... Here's the function code :-

 function getTokenForUSD(uint256 _usdAmount) public view returns(uint256 , uint256 tokenAmountRequired) {
    
    // Calculate the token amount required for the given USD amount at the current price
        tokenAmountRequired = (_usdAmount * 1 ether) /getCurrentPrice();
        // Calculate the tokens available in the current phase
        uint256 tokensAvailable = phaseLimit[currentPhase] - tokenSold;
        // If the required tokens can be fulfilled from the current phasse, return the required token amount
        if (tokenAmountRequired < tokensAvailable ) {
            return(_usdAmount, tokenAmountRequired ); // Return token amount in whole units (tokens, not wei)
        }else if (currentPhase == 2 ){
        uint256 remainingTokens = tokenAmountRequired - tokensAvailable;
        // Calculate the remaining USD equivalent to cover the remaining tokens
        uint256 remUSD = (remainingTokens * getCurrentPrice())/1 ether  ;
            return(_usdAmount-remUSD, tokensAvailable);

        }else{
        
        uint256 remainingTokens = tokenAmountRequired - tokensAvailable;
        // Calculate the remaining USD equivalent to cover the remaining tokens
        uint256 remUSD = (remainingTokens * getCurrentPrice())/ 1 ether  ;
        
        
        // Calculate the tokens needed from the next phase
        uint256 tokensNeededFromNextPhase = (remUSD * 1 ether)/ phasePrice[currentPhase + 1];
        
        
        // Calculate the total tokens receivable by combining tokens from the current and next phases
         tokenAmountRequired = tokensAvailable + tokensNeededFromNextPhase;
        
        return (_usdAmount, tokenAmountRequired ); // Return token amount in whole units (tokens, not wei)
    }
}`

Here are both testnet and mainnet links. Mainnet : - text Testnet: -text

I was trying to get transaction values on frontend on mainnet, on testnet i can get values and even reacd the function on explorer.