Did you initially create the mod as an add on?
Depending on the type of mod you want to release, you have to make either an adventure project, or an add-on project:
Add-on:
Can be toggled on and off between play sessions.
Savegames keep working with or without any of them. Story changes get patched in/out when enabling/disabling add-ons.
Add-ons are generally projects that add new content to the game (like extra items, classes or quests) or change existing content (turn the Red Lizard blue).
Adventure:
You always start a new campaign (story and gm) for a specific adventure.
An adventure is fixed for a game session and savegames are specific to an adventure.
An adventure contains the story you will be playing and all content related to that story.
There's probably a way to fix it, but I don't know it off the top of my head.
