Framerate time higher than scenerendering

In windowed mode I get the stats in the picture, but in fullscreen mode:
In fullscreen 1920x1080 mode I get:
75fps, 11.5ms framerate, 7ms drawcalls, 62680ms(62k ms) GPU, 3ms game
But the scene rendering there is not more than 7ms, so why am I getting 11.5ms framerate?
I’m trying to solve this but don’t really have an idea, screenshot in fullscreen mode didn’t display stats for some reason so I wrote it down.

What about ‘stat gpu’ and GPU Visualizer (Ctrl + shift + , )?

Frame is the final time, that can be affected either by CPU or the GPU (whichever is waiting for the another). I made a short video about framerate statistics: UE4 Graphics Profiling: Measuring Performance - YouTube

Regards,

Oskar