In the second picture you see the “Summary Output” with all zero. This is the same value as it is shown inside CMK. Can you have a look at the output of this check at the same time in CMK?
The graph shown in the last screen is then relevant if you zoom in that it is possible to see every minute.
With the actual zoom the graph looks a little bit strange with all the small peaks. If you zoom to the last 10 minutes or so i expect to see every other minute a zero value.
This is all just a guess. 