@TalhaUysalArt I have my theories on why it’s happening and the possible solution.
Some collections are cloned with their GUID.
This is because they are copied in from the epic games launcher. If they were imported properly via the engine then the assets would probably be assigned unique GUIDs during the import process.
The cloned guid also probably points toward the fact that in the original paragon project where all of the characters where in the same game, they most likely shared the same parameter collection among themselves.
To be able to put each character separately on the market place page they cloned the shared asset to each individual character. This most likely causes a problem during import because assets are recognized by the engine via the GUID so the engine at some point doesn’t know which one of the assets it should point to, most likely corrupting one of them depending on memory access.
The solution that comes to mind is to delete the clone collection and in the popup set it to replace it with the one from the other character (always choose the same one to narrow down to until no clones remain).