The versions on Modrinth named MCRGB 0.2.3-1.20.2 and MCRGB 0.2.4-1.20.4 seem to both have a version number of 0.2.2-1.20.2, which is already used by an existing version. I assume the versions should be unique to match the names on Modrinth.

As a side note, using a + instead of - for the Minecraft version in the version is recommended to avoid issues with sorting versions.

Thanks for bringing this to my attention. This will be corrected in future versions.