Running a report fails - missing data

[Paul Russ]

I'm trying to run a report on our servers showing the the "Inventory" list items - system name, IP, etc. We have nearly 700 servers but when the report is run it will return data on no more than 4 or 5 servers, sometimes less.

Here's the path..
Reports>New Report>All Servers> and then selecting a report of the "Inventory" items (system name, IP, etc)

I have been running the "Scheduled Tasks" from the "Tasks & Logs" links manually to populate the database but with no changes to the Report's output. Is there a particular Task (eg Bi weekly Data Collection) I should be paying att to here, or have over-looked something in the documentation.
Many thanks
Paul