My archives and meta are unaligned, way at bottom of page

I tweaked inside the Loop to post author’s name, and the header color. Everything worked fine for a few times and then all of a sudden, the right column (with archives, categories and meta) dropped way to the bottom of the page.

Does anyone know how to fix this? ??

If there’s no easy fix, should I reload WordPress as if I were upgrading? I’m new to this…

Thanks!