Please note that for Bluff, according to the rules the 1 is wild, so it can represent any face value!

If you had a situation where there were at least 2 dice that had a 1 on each of them, then that would count as 2 3s for that round since 1 can be anything. To go back to your original example, if there was 1 die with a 4 on it, and 2 other dice that had a 1 on each of them, that would count as 3 4s when counting everything up.