First visit in day is duplicite in piwik 0.9 only

Support & Bugs
1

Hello,
I installed Piwik 0.9 and now I see for example in one day I have 5 visits in piwik 0.9 but in piwik 0.6.2 is it only 4 visits.
Why this happens? It looks like piwik 0.9 counts first visitor in a day as duplicate.