Why are the questions not getting the check marks when my work is correct?

JavaScript
#1

Tell us what’s happening:
The system is not the same. I am discourage as the green check are not popping up as I check my work.

Your code so far
function addFive() {
sum = sum + 5;
}


// Example
var sum = 0;
function addThree() {
sum = sum + 3;
}

// Only change code below this line

function addFive() {
sum = sum + 5;
}
// Only change code above this line
addThree();
addFive();

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.1.2 Safari/605.1.15.

Challenge: Understanding Undefined Value returned from a Function

Link to the challenge:
https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/basic-javascript/understanding-undefined-value-returned-from-a-function

#2

Your code is indeed correct, however I saw that you are using Safari as web browser.

If you don’t mind, try completing the same challenge with Google Chrome, and see if you can pass it.
Hope this helps :+1:

#3