Line and Stacked Column Chart with Total

Hello,

I have a Line and Stacked Column Chart that displays distinct user login counts to an app. As the screenshot shows, each month contains a distinct count of user logins for that month. What I am trying to do is to add a total count that adds up the dinstinct logins for each month currently displayed and posts that total above the column. I found multiple videos online that explain how to do this using a Line and Stacked Column Chart and have implementated the visual just as the videos describe. However, of course, my implementation does not act like the ones in the videos. Per the screenshot you can see that the "Line" count applies to the first month but not the second and third, it doesn't total.

Any input would be much appreciated.