Grid on an archive page

Hello!
On my portfolio page it is all right with the grid – there are 4 rows: http://www.zink.by/portfolio/
But on the same archive page there are always 3 rows: http://www.zink.by/portfolio_entries/flash/

I added the following Quick CSS code(cos all prew imgs must be 200×200 px always):

#top.page .inner-entry {
width: 200px;
height: 255px;
margin: 0px auto 27px;
text-align:center;
}

#top.archive .inner-entry {
width: 200px;
height: 255px;
margin: 0px auto 27px;
text-align:center;
}

How can I make it to be 4 rows in grid on every page!
Thank you!