CTFStatPanel aka the "On the bright side" panel shows up on freezecam screenshots seemingly due to not hiding in time before engine grabs a screenshot.
It seems like checking IsTakingAFreezecamScreenshot() inside ShouldDraw() is unreliable at high FPS (problem triggers at more than 130 fps on my machine). I assume whatever delay exists before the engine sets IsTakingScreenshot to true and actually takes a screenshot must be fps dependent.
This isn't a problem for CTFFreezePanel - the freezecam UI itself, as it's the only view that hides on screenshot key press event. Hiding CTFStatPanel inside that event provides a simple workaround.