Featured posts not showing in Showcase-template in IE8

Strange thing happening with my Twentyeleven Child theme:
I have picked 3 sticky posts to show up in my Showcase template. In FF6 en Chrome all 3 show up. In IE8 only 1 sticky post shows up:

IE8: https://www.martinbergsma.nl/wp-content/uploads/2011/08/featured-ie.png
FF6: https://www.martinbergsma.nl/wp-content/uploads/2011/08/featured-ff.png

Anybody having the same problem ? And does someone know a solution ?