This was fixed as part of bug #4737 http://pkp.sfu.ca/bugzilla/show_bug.cgi?id=4737
-- however, the patches were written against OCS 2.3, not 2.x, so you might have trouble back-porting the fix. Unless you're handy with PHP, I'd suggest living with it. The patch actually removes the presentations count entirely (in addition to a massive optimization of the number of DB requests required to build the other counts); you could get the same result by modifying the templates/user/index.tpl template file and commenting out the HTML there. If we get requests for the presentations count to be re-added, we may well get around to it.
Public Knowledge Project Team