Hi.
I assume you are using the command ‘shot’, correct?
Try ‘HighResShot’ instead.
You can also control the resolution of the screenshot: ‘HighResShot 1’ for 1:1 scale or ‘HighResShot 0.5’ for a scaled down screenshot.
Depending on which engine version you are using you may run into new problems with the camera location for the screenshot not matching your view in the HMD, but that’s another story.