Two issues i've escalated and still waiting a response from support.
1) The date picker (range) doesn't match report (off 1 day). Put 12/10 get 12/11 on report.
2) More importantly, i run this report (to get total ITEMS, not ORDERS) each week (Mon-Sun) so have that count. When i went back a few weeks later and ran the same report for those same dates, get DIFFERENT counts. Clearly an issue.