It looks like issues in the code on the WA_Store_Cart_PHP file starting on line 125-151
you can update it to:
//eCart Rule
function WAEC_WA_Store_Cart_USPSShipping() {
$totalShipping = 0;
if (true && (isset($_SESSION["WA_Store_Cart_USPS_Quote"]))) {
$totalShipping += floatval($_SESSION["WA_Store_Cart_USPS_Quote"]) + 0;//Result
}
return WA_eCart_FormatNumber($totalShipping, $this->ForceDecimalsC, $this->DecimalPlacesC);
}
//eCart Rule
//eCart Rule
function WAEC_WA_Store_Cart_FedExShipping() {
$totalShipping = 0;
if (true && (isset($_SESSION["WA_Store_Cart_FedEx_Quote"]))) {
$totalShipping += floatval($_SESSION["WA_Store_Cart_FedEx_Quote"]) + 0;//Result
}
return WA_eCart_FormatNumber($totalShipping, $this->ForceDecimalsC, $this->DecimalPlacesC);
}
//eCart Rule
//eCart Rule
function WAEC_WA_Store_Cart_UPSShipping() {
$totalShipping = 0;
if (true && (isset($_SESSION["WA_Store_Cart_UPS_Quote"]))) {
$totalShipping += floatval($_SESSION["WA_Store_Cart_UPS_Quote"]) + 0;//Result
}
return WA_eCart_FormatNumber($totalShipping, $this->ForceDecimalsC, $this->DecimalPlacesC);
}
//eCart Rule