You should update to the latest version of BlogKori. Some new improvements and bug fixes in the newer version of this theme. So when the next time you see there is a new version of theme available, feel free to click and update.
From now on, BlogKori theme will be in active development. Please follow this blog blogkoritheme.blogspot.com to learn about new updates and features coming to the theme.
P.S: All of you past code changes will be lost, so I recommend you make a child theme when doing changes to the site design on your own.