Credit card checker issue

this is my code for credit card checker.

// All valid credit card numbers
const valid1 = [4, 5, 3, 9, 6, 7, 7, 9, 0, 8, 0, 1, 6, 8, 0, 8]
const valid2 = [5, 5, 3, 5, 7, 6, 6, 7, 6, 8, 7, 5, 1, 4, 3, 9]
const valid3 = [3, 7, 1, 6, 1, 2, 0, 1, 9, 9, 8, 5, 2, 3, 6]
const valid4 = [6, 0, 1, 1, 1, 4, 4, 3, 4, 0, 6, 8, 2, 9, 0, 5]
const valid5 = [4, 5, 3, 9, 4, 0, 4, 9, 6, 7, 8, 6, 9, 6, 6, 6]

// All invalid credit card numbers
const invalid1 = [4, 5, 3, 2, 7, 7, 8, 7, 7, 1, 0, 9, 1, 7, 9, 5]
const invalid2 = [5, 7, 9, 5, 5, 9, 3, 3, 9, 2, 1, 3, 4, 6, 4, 3]
const invalid3 = [3, 7, 5, 7, 9, 6, 0, 8, 4, 4, 5, 9, 9, 1, 4]
const invalid4 = [6, 0, 1, 1, 1, 2, 7, 9, 6, 1, 7, 7, 7, 9, 3, 5]
const invalid5 = [5, 3, 8, 2, 0, 1, 9, 7, 7, 2, 8, 8, 3, 8, 5, 4]

// Can be either valid or invalid
const mystery1 = [3, 4, 4, 8, 0, 1, 9, 6, 8, 3, 0, 5, 4, 1, 4]
const mystery2 = [5, 4, 6, 6, 1, 0, 0, 8, 6, 1, 6, 2, 0, 2, 3, 9]
const mystery3 = [6, 0, 1, 1, 3, 7, 7, 0, 2, 0, 9, 6, 2, 6, 5, 6, 2, 0, 3]
const mystery4 = [4, 9, 2, 9, 8, 7, 7, 1, 6, 9, 2, 1, 7, 0, 9, 3]
const mystery5 = [4, 9, 1, 3, 5, 4, 0, 4, 6, 3, 0, 7, 2, 5, 2, 3]

// An array of all the arrays above
const batch = [valid1, valid2, valid3, valid4, valid5, invalid1, invalid2, invalid3, invalid4, invalid5, mystery1, mystery2, mystery3, mystery4, mystery5]


// Add your functions below:
// every second position is not doubled!!



function validateCred(array) {
    const reversedArray = array.slice().reverse();
    const lastPosition = reversedArray.splice(0, 1);
    for (let i = 0; i < reversedArray.length; i += 2) {
        reversedArray[i] *= 2;
        if (reversedArray[i] > 9) {
            reversedArray[i] -= 9;
        }
    }

    const summedArray = reversedArray.reduce(
        (previousValue, currentValue) => previousValue + currentValue
    );
    return (summedArray + lastPosition[0]) % 10 === 0;
}
let invalidCards = []

function findInvalidCards(cards) {;
    for (let i = 0; i < cards.length; i++) {
        if (validateCred(cards[i]) == false) {
            invalidCards.push(cards[i]);
        }
    }
    return invalidCards;
}

console.log(findInvalidCards(batch))



let badCardCompanies = []

function idInvalidCardCompanies(invalidCards) {
    for (let j = 0; j < invalidCards.length; j++) {
        if (invalidCards[j][0] === 3 && badCardCompanies.indexOf('Amex (American Express') === -1) {
            return badCardCompanies.push('Amex (American Express)')
        } else if (invalidCards[j][0] === 4 && badCardCompanies.indexOf('Visa') === -1) {
            return badCardCompanies.push('Visa')
        } else if (invalidCards[j][0] === 5 && badCardCompanies.indexOf('MasterCard') === -1) {
            return badCardCompanies.push('MasterCard')
        } else if (invalidCards[j][0] === 6 && badCardCompanies.indexOf('Discovery') === -1) {
            return badCardCompanies.push('Discovery')
        } else if (badCardCompanies.indexOf('Unknown company') === -1) {
            return badCardCompanies.push('Unknown company')
        }
    }

    return badCardCompanies

}

findInvalidCards(batch)
console.log(invalidCards)
idInvalidCardCompanies(invalidCards)
console.log(badCardCompanies)

output from the last function is only: [Visa]
it should give all company names without duplicates. I can’t find error in my code. Any ideas?

Consider what return does.