Footer area not the same height

In the footer I have my widgets all placed int the first space. (So in footer area 1 on space 1 "trending", in footer area 2 on space 1 "hier ben ik mee bezig" etc.) Though I used everywhere space 1, the first item is lower than the other 3. Please see http://www.diydiva.nl/ Can you please help me to get everything at the same height?