Why? I don’t know.
But the sidebar is there just pushed down to the bottom. An easy fix is to change the width from 250 to 240.
#secondary {
width: 240px !important;
}
I don’t know your theme but it appears you have them options where you might be able to do this. If not you might have a custom CSS box where you can paste this in.
Wow. That was easy. I know I don’t know you, but I totally love you right now.
THANKS!!!!