I asked friends but we couldn't reproduce the error. I would look in detail if we had an example number that produces the error. Let's pretend it didn't happen 😇 They should be gray. 😂

Btw if you typed the correct number again, it's normal for it to look gray. If there is just one "3" in the answer, it will only be green in the correct place an the other "3"s would be gray. Maybe it was because of this.