It might seem a bit confusing at first, but that's because the public and Patreon builds got their own numberings. The reason for that is that Spedumon doesn't just release previous Patreon builds to the public after a while. The public builds come out way less frequent than the Patreon ones (which get released monthly), and always contain a lot more content. That's why public build 0.18 has way more content than Patreon build 0.18. To give you a better understanding, public build 0.18 contains all the content of Patreon build 0.58, which is 7 updates behind the most recent one.