The changes I made for Portfolio Post Number and other settings are not taking any effect to the Homepage. For a separate page (Portfolio) it does. I changed the Portfolio Post Number to 8, it still shows more then 10 on homepage.
I found the issue. For the Homepage I use a Predefined Template/Dynamic Template so the Portfolio Settings for my Homepage are in the Template Builder, not in the Theme Options.
PS: This settings are a bit confusing because they appear in several places.