That's seems pretty strange then. What happens if you publish it as a private or friend's only mod? Same problem?
Worst case scenario, you could upload your updated version on Nexus, and link it in the Workshop version's description for the time being, until someone from Larian can help you figure it out, or we figure out a solution.
Have you tried restarting Steam? Maybe there's some sort of verification error that the account using the editor =/= the mod's author on Steam. Or maybe something is specifically corrupted in your mod's files, related to the Workshop. Maybe look at the Mods/YourMod/meta.lsx file and see if anything looks off - Make sure none of the xml tags/nods/elements are broken, and make sure your attribute values don't contain something invalid, i.e.:
<attribute id="Description" value="This is technically an invalid "description" since it has quotes within quotes" type="30" />
