Line Spacing in Article Suggestions

I have a strange effect with the line spacing of the shown articles. There is little line spacing in the intro text of the first, third and fifth article. The spacing of the second and fourth article is much higher.

You can see this even on your website used as Article Suggestions demo:
http://www.boddunan.com/business-a-finance/2-google-adsense/32-ways-to-improve-adsense-clickthrough-rate.html

Or is this effect intended?

(Sorry for putting this question in the wrong forum category.)

Greetings
Ulrik Andresen