First make sure you did right the settup Setting up the Asset Manager doing it wrong it can affect the base game from what i heard and that i think happened to you.
You will have to do a correct settup to extract the original files for the base game and expansions using the guide above .
After doing that you will have to use the archive tool to extract the Mod files Archive tool extraction guide
All you need can be found on the forum but the steps are the ones that “mamba” said earlier.
PS : Extract the files from original DOM not the one i gave you because in there the inventory and stash are not the ones that dom has. You can add only the stash in your dom version and keep the inventory and bags as they are.
Edit :Grim Arc and Arz , but i strongly recommend the archive tool .