I published a scenario in the workshop. But somehow the TSC or Steam got something mixed up. Because when you see required add-ons, Steam/TSC shows an add-on (here Wessex Main Line: Southampton - Salisbury Extension) that I don't even have - what went wrong?
That is quite common for the Steam Workshop to mix up tags AFAIK there is nothing you can do about it Most Authors put a comment on the page saying "DLC xxx is not required"