Star schema filtering in visuals

Hello all - looking for some quick troubleshooting/second pair of eyes as I've been staring at the problem for too long at this point. 

After previously using a single table schema for individual sets of data, I'm working on adapting to a star schema that contains all relevant tables and columns for any sets of questionnaire data (see below). The idea is that this structure and report could be used with any given set of data, as the fields are normalized. 

I am having trouble with visualizations behaving as expected. For example, I have chart 'C12' and 'C7' using X: Responses.OptionID and Y: Responses.RespondentID (distinct count). Each visual is filtered to use Questions.QuestionID with the respective question selected. However, this results in no interaction between the two visuals when anything is selected, the data either disappears in the other table or opens the table view.

I've tried countless other methods including using measures, using the dimension tables as the data sources, changing the cardinality of the model, checked the interaction settings, etc etc etc. 

I think I am missing something very obvious; would appreciate any extra eyes and brains on this. Let me know if anything needs clarification.