Hello!
What version of Xeoma do you use? You can configure 'Motion detector' module's settings according to the inscription in the upper right corner.
If it says 'Skipping', then module detects motion and archive will be recorded, if it says 'Not skipping', then motion isn't detected.
You can also try our latest beta 17.3.30 for your tests:
http://felenasoft.com/xeoma/en/download/