The "Next Events Teser" breaks the CSS layout. Any teaser in the column to the right does no longer respect the margin between the columns.

Reproducing task: Open demo web site home and add a "Next Events Teaser". Move the new paragraph to the top of the left or middle column.

@@ -1276,7 +1276,7 @@ table {
 #main .event-list {
        overflow: hidden; /* ie 6 */
        position: relative;
-       margin: 0 0 20px 0;
+       margin-bottom: 20px;
        border-top: 4px solid #b3b3b3;
        border-bottom: none;
 }

Removing the margin settings in the style solved the problem for me. Compare also with the similar style for the "Lastest News Teaser" that does not have this bug.