[ARCHIVED] Incorrect Tickets Created Count

I was creating a report which returns the number of created tickets for a specific month by using the predefined metric "Tickets Created"(Zendesk: Ticket Updates dataset). However,  the returned total count is incorrect. 

Upon further checking, I've noticed that there are tickets which never had a NULL status (Status' Previous Value = NULL; Basis of the predefined metric). Attaching a screenshot below for reference.

I appreciate any inputs on this concern.

EDIT: There is a bug wherein the previous value is not stored in its corresponding "Changes - Field Name" (Status for this case)