Did you have three votes, or more than three? If you had the same number of votes as there were positions to be filled, that's a plurality block vote. Winning slate takes all.

https://en.wikipedia.org/wiki/Multiple_non-transferable_vote

> RCV, once someone has gotten their candidate in, their vote is exhausted.

Hi, Australian here. What happens with multi-winner single transferable vote is that there's a _quota_ and then ballots for candidates who have reached quota get _reweighted_ (not quite the same thing).

This quota-and-reweighting system can (and must!) be applied to multi-winner Approval too - jpfed linked the wiki article.