Qlik can total in different ways
Auto gives the correct Total but at times the individual dimensions won't add to the TOTAL. For example if you join keep a table that has a many to many relationship. Or one to many where you link the many table to a total in the one table
Or use distinct for example
You can set the total to Sum of dimensions (as opposed to auto) if that's what you want. But find out what the correct total is.