Presumably you have done something along the lines of creating a custom resolution in your graphics card or Windows settings that has scaling applied to stretch it from 1440 x 1080 to 1920 x 1080?
To get the best performance, FBX captures directly from the game but this means that the image is captured before the scaling is applied so the game's in-game 4:3 resolution is always used instead.
We will add an alternative recording mode that simply records exactly what you see on the screen at some point. This would capture the stretched image but the performance will probably not be as good as the current method.
