Getters returning undefined for all properties except for those of the last element in an array

Question

I'm using a map with key: password, value: Guest object to store guest information in my program. At the end of my program I pass an array of the guest Objects to a function to write to my txt file:

writeToGuestStore('./inputFiles/guestStore.txt', Array.from(guestStore.values()));


writeToGuestStore function:

function writeToGuestStore(file, guests) {
        //console.log(guests);

        const writeFile = fs.createWriteStream(file);
        writeFile.on('error', err => console.log(err));

        for(let i = 0; i < guests.length; i++) {
            let elem = guests[i];
            //console.log(elem);
            let password = elem.getPassword();
            let visit = elem.getVisitCount();
            let orders = elem.getOrderStore();

            //console.log(password);
            //console.log(visit);
            //console.log(orders);

            writeFile.write(/* elements of guest */);
        }

        writeFile.end();
}

I believe that my guest objects are being passed properly to the function, by which I mean all their properties are defined as they should, however the lines where I get the password, visitCount, and orderStore values only seem to return the correct values for the last element in the array, returning undefined for all other guests:

Guest  {
  name: 'ethan',
  allergyInfo: [],
  nutrients: {},
  money: 9,
  [Symbol(visitCount)]: 0,
  [Symbol(password)]: 4268,
  [Symbol(orderStore)]: Map(0) {},
  [Symbol(addOrder)]: [Function (anonymous)]
}
undefined
undefined
undefined

vs.

Guest {
  name: 'elliot',
  allergyInfo: [],
  nutrients: {},
  money: 4,
  [Symbol(visitCount)]: 0,
  [Symbol(password)]: 4267,
  [Symbol(orderStore)]: Map(0) {},
  [Symbol(addOrder)]: [Function (anonymous)]
}
4267
0
Map(0) {}

Prior to using a .txt file I attempted the same guest storing with a JSON file with replacer and reviver functions to customize how the properties are written / received, however I was running into the same issue in which only the last guest's values for password, visitCount, and their orderStore were accessed properly.

Any suggestions?