The Australian parliament is weird but it kind of works.

Members of the House of Representatives ("lower house") are elected via preferential voting and each member represents a single electorate (there are 150 electorates), all of the electorates are roughly proportional population wise (there is an independent body that draws up the boundaries), however the geographical area covered by each electorate can vary greatly. For example in the State of New South Wales there are dozen of electorates covering the various suburbs of Sydney and one massively sized electorate covering a huge rural portion of the same state where population density is very low.

The Senate (Upper House) is fixed there are 12 members for every state and 1 member per territory. This means that Tasmania which is a fraction of the population of New South Wales has exactly the same number of Senators. There are about half a million people in Tasmania compares to 8 Million+ in NSW. So relatively speaking your upper house vote has way more power if you live in a smaller state.

The senate also uses transferable vote with a quota system. The quota system and "vote transfer" makes it a little weird and it is why minor candidates can percolate up and end up a senator despite relatively small primary vote.