Doesn't marking as readed?

[spider58]

HEllo. Sorry for my bad english.

3.8.7 im using.

At website main page we seeing category images as "Have New posts" and category images are colorful.

such as

After read all posts in a category, image of these category icon must change with "Have no new posts" and category images must be "black - white"

such as

But images doesn't change with "black - white". Always shows this

When i double clicking at this image with mouse, category is marking readed and image is changing with

How can i solve this problem. Category must mark "Have no new posts" automatically after read all posts.

Im really sorry for my bad english.

Inadvance thanks for relatoıns.