This is actually an issue because I didn't know what the hell fizzbuzz is

Start from the first kata in series if this one is too hard for you

No, the example is fine. the 3 in 13 is to be considered a 7 and it becomes a 17, that's why ordered ascending the expected result is [12, 14, 13]. 3 means 7 in that other planet, but you shouldn't translate to your own language, so, no, the answer is not [12, 17, 14]. Nothing to fix, not a kata issue.

not a kata issue, works fine in ruby, and you have passed the kata anyway

Not a kata issue, at least for javascript, it's pretty clear. If you're talking about some other language, there is another open issue below: https://www.codewars.com/kata/53b138b3b987275b46000115/discuss#63ad157f0af269000f92c022 and you're probably talking about the missing Ruby block. Added it for Ruby.

There are several passing solutions that only modify the last two letters, so that would be impossible.

Prehaps there was a specific word (test case) that was confusing?

Exactly, horrible description

The intro text is badly written

What is concretely badly written?

the premiss not clear

For some reason, the kata has the puzzle tag.

Please, use spoiler flag next time.