If you have a 4K display, your screen recordings may not include the entire screen and or part of the recording is clipped off. To fix this, you will need to adjust your Windows display settings, and set your scale and layout to 100%.
Please note that this change may result in your Windows icons appearing smaller on your desktop. Once you are finished with your screen recording, you can readjust the scale back to its original setting to return the icons to normal size.