Curseforge is listing and installing version 4.3 over 4.3.1. It appears the builds fired simultaneously on push, and 4.3.1 finished earlier than 4.3.

(A few things also seem to be reading the addon version as "@project-version@", like the changelog.)

Pushed a new update that should fix the issue. The builder should be substituting the ""@Project-Version@" with the version number getting released, so ill have to see why it is not.