Recorded videos colours are really bright. But only on some software

This was caused by a setting in Windows 10.

There's an option to display HD for certain games which was on and I had to switch it off.

To get to the setting right click your desktop and click on "display settings" or else go to the Windows 10 home/start menu and click on the cog (settings) and find "display".

Under the heading "Windows HD Colour"

Switch off "Use HDR"

This also stopped the delay in recording!

Windows 10 Display Settings