color background of profile doesn't change

even when i change templates it stays the same 

I cleared the cache 

and everything 

it is only one profile!

how can i fix it?

Most probably this is due to this bug:

https://github.com/boonex/dolphin.pro/issues/53

It will be fixed in 7.2.1

thanks 

and the update is released so i can upgrade now?

Hello Alex, 

The dolphin is upgraded but my problem is not solved 

There is "Profile Customizer" module, where users can change their profile page background (and other styles). If you don't want to allow users to customize their profiles you need to uninstall "Profile Customizer" module.