Kernel-desktop re-installing when installing a new application

I am using openSUSE 13.2 64 bits.
Every time I install a new application, the kernel-desktop (optimized for the desktop 3.16.7-29.1) re-installs itself.
In YaST2, a green vertical arrow above three green dots is displayed and it is impossible to change this symbol.
What is wrong?
I apologize for my bad English.
Thank you for your answer