/META-INF/neoforge.mods.toml for the portaljs-1.21.1-1.1.0.jar has the old incorrect version under the [[mods]] section:
[[mods]]
modId="portaljs"
version="1.21.1-1.0.3"
displayName="PortalJS"
updateJSONURL="https://raw.githubusercontent.com/wolfieboy09/PortalJS/refs/heads/master/updates.json"
#displayURL="https://change.me.to.your.mods.homepage.example.invalid/" #optional
logoFile="portaljs.png"
authors="Wolfieboy09"
it should be version="1.21.1-1.1.0"