Confused: nXt farm not using full CPU power

I’m just starting to use the Flamingo render farm to do sun study animations and distributed renderings in general. Every time I’ve checked on renders in the past both machines are maxing out the CPU processing to get the renders done quickly. I just ran a new animation and both machines are hardly doing any work, mine’s only running around 15%; I could have gotten it done faster by rendering each frame separately. What would be causing this? Images of settings and CPU usage attached.