Floating DIV column out of position

I can't find the reason why the third column at my site slid down. You can see third column under the center column. Something has changed and it slid down. Can you find what may 开发者_JAVA百科have happened?

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It looks like in this div, the bottom padding seems a bit excessive:

<div id="articlesBlock" class="rightCol" style="margin-top: 3px; 
    text-align: left;
    border-radius: 10px 10px 10px 10px; padding-bottom: 2214px;">