Fabric shows you the following warning:
Mod horsecombatcontrols uses the version f1.21.0-1.0.5 which isn't compatible with Loader's extended semantic version format (Could not parse version number component 'f1'!), SemVer is recommended for reliably evaluating dependencies and prioritizing newer version

Valid semver would be 1.0.5+f1.21.0

This is of course a minor thing and doesn't really cause any issues