Online search - PsycINFO OvidSP - many older references missing

When I use Online search and choose PsycINFO OvidSP there are way too few hits among the older references (2007 and older).

E.g…: When I search for Brown and 2007 I get 5 records! When I search for Brown and 2008, 2009 or 2010 I get around 1000 records each year.

How do I fix this? We have EndNote X4.

The problem is only in PsycINFO OvidSP, online search in Medline OvidSP is working correctly.