Yes, when you reach the second 5 you've found the first pair ([5, 5]) that adds up to 10 and you return it.

([8,5,6,5,4,2],10)
should return [5,5] because that is closest set to the left?

What was the input value? Without it we can only guess.

Given a list of integers and a single sum value, return the first two values (parse from the left please) in order of appearance that add up to form the sum.

What's unclear about that?

Please, read this: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution#post-discourse

well done!