SP2010 - Web Analytics report (usage.aspx) and Storage metrics (storman.aspx)

Hello,

On one my site collection, I'm seeing different values on usage.aspx and storman.aspx page. The difference is alomst ~1GB, usage.aspx shows almost 1GB more than storman.aspx.

I made sure no data is in the both the recyclebin at the site collection level. but still no luck. Can someone please guide me to troublehsoot this issue? Also we dont want Import/export to resolve the issue at this point of time.

Please help:)!!!

Thanks,