I am still unclear. You say it is a two column layout, but I don’t see the left column, or is it what is extending under the text, and if so why is the second column covering the left one, as if we would be to make the second column as tall it would completely hide the left one??
If This is the left column we see extending / under, what makes that column extend to the bottom.
You need to clarify, and eventually paste the whole HTML you sue in that page content here