We launched two campaign recently and there are two types of tagging on our leads form:
1. Event tagging-complete will fire once the user click submit
2. Page level tagging- once the user submit they will direct to a acknowledge page with page level tagging.
So I use below method and try to compare the leads number total. There are more leads by using the page method comparing the event tagging one.
And the application id instances is not equal to either event number and page number.