This question might be best suited for support as they can help you get your data prepared for analysis. If you've already found a solution, please feel free to share so other users can benefit from the knowledge! :-)
I did not found a solution for the problem.
Data reshaping is a must in this case.
However, for removing the asterix in your data always make sure what data you are trying to visualize and then decide which data source to select as your primary one (depends on from what source you drag your fields first).