Side bar help

Guys, I’m new to WP and has been using digerati peninsula’s truebluewp template. Just a few minutes ago, I have observed that the sidebar has moved to the bottom after the posts where instead before, it can easily be viewed at the top, side by side with the newest post.
I would really ask for your help on how I should bring this back.
My site is at https://www.estanli.net/blog .

Just an additional detail. I tried copying over the original index.php and wp-layout.css from the template but the same thing happens.

That looks like a div misplacement.
One of the closing </div> belongs under the sidebar, not on top of it.

hi, thanx, but, how should I check for it? What file should I edit for this?

the index.php has the div markings

Not sure about the divs. For my 2c a very subtle and tiny miscalculation of the width has crept in. I might try a crude approach like adding 10px to #rap in the CSS. I also might try taking out the left and right borders also in rap. This is a box model thing. The file you need is wp-layout.css.