Why is mobilelaunchnumber empty in clickstream?

[jasminesthegrea]

Why is the mobilelaunchnumber an empty string for many rows in the clickstream data? Thanks

[ForgotPassword4Times]

These are silly questions, but to confirm:

1.) You are evaluating data sent from an application using an analytics SDK?

2.) You aren't accidentally looking at the 'mobilelaunches' column?