correct table rows but total needs help - SUMX maybe?

Here is my scenario: I have three separate orders shipped that day, each order has a different number of lines within it. Order #3276 has 3 lines, #3293 has 2 lines, #3319 has 3 lines. I calculated number of lines using a variable. That part works as intended. 

What do I do so that my total shows 8 lines shipped (with 3 associated orders) instead of 7? Thank you much!!!