Calculated height is too high

I am trying to figure out why the div .ContentSearch and .ContentMain have a calculated height of 1518px or 2014px respectively. The page is www.terraporta.cl/default.aspx.
Any clue ?

By the way I am aware that CSS check comes out with loads of error, mostly due to a component I am using.

Update: fixed. Helpful tool: Opera Dragonfly