Import Export problem

I imported about 200 leads. When I run a report and/or run a View using the "Lead Source = Conference ACVC" the report only returns 10 leads. I have checked the lead source field and the all contain the proper source, spelled correctly, etc. No other criteria is being used.

If I change the criteria to the date I imported the leads I get all the leads with the Lead Source field that contains "Conference ACVC", very strange.

Any idea why my results are not correct when using the lead source field?

Thanks
Tony