I've loaded your model and indeed it seems that Qlikview is joining too many fields due to its associative linking.
I suggest loading with a qualify *;
// Beginning of script
[Trial for Qlik.xls]
(biff, embedded labels, table is B_Data$);
.... Loading the rest of your sheets...
// end of script
It sounds like the data model that is being created is the route of the problem. Qlik Sense will join tables based on common fields names so you need to think through how your tables should join up.
It sounds like you are on Qlik Sense 1.1 because you said you are using "Quick Data Load" option. In Qlik Sense 2.0 was have updated that feature and changed the name to "Add Data". In the newer version you can now profile your data and adjust the field names so they join up correctly using a visual interface. You can learn more about this in this posting: Qlik Sense - Using Smart Data Load (video). You may also want to take a look at our other how to videos found here: New to Qlik Sense Videos