Yootheme tells me that their template 100% compatible with K2.
But I have very ugly with k2 display, what am I missing?Please take alook :

The display in top of single article :

Bottom of the single article display :


How to resolve this?

I set the template in k2 category : default and no other option available.

Please help

I think you have to make a template override from yootheme. It's all explained in the support documentation on their website.

K2's css is not loaded.. please check the template settings

Apa kabar Kannan? You always here to help noob like me! I hate beeing stupid!
Do you mean yootheme template setting? as far I know, I don't see any CSS setting in yootheme.

Chucknology : I don't do any overrides to the template

Khabar Baik Jospeh :)

Is that article linked to a menu item ?

Nope, It's single article and not linked to a menu item.