Desktop Fonts doesn't follow Interface Fonts.

From Tweak Tool (gnome-tweak-tool), I've changed fonts Interface, Monospace etc But Desktop Fonts nerver changed!

Unable to change Desktop fonts. (I currently set 'Sans 10' as Interface fonts But can't find any changes of fonts on Desktop).

Sometimes it requires re-login to take/change effect. so, I also tries re-logging, even restarting but I nothing changed to Desktop fonts.

I attacked screen-shot of current font setting.