Hi Gustavo,
Excellent question and I can appreciate the interest in the discrepancies.
With demo systems, we're generally not dealing with live data. The way it's generated can vary and, at times, can cause abnormalities within the context of the data. This is what is going on here. Beyond this, in production, it's advisable to ensure your looking at the most specific time range possible to reduce the likelihood of data aggregation complexities. e.g. looking at 24 hour data is less effective than looking at 5 minute aggregation levels. The following two links may be beneficial too.
Server Visibility: https://docs.appdynamics.com/appd/24.x/24.4/en/infrastructure-visibility/server-visibility
Troubleshooting Applications: https://docs.appdynamics.com/appd/24.x/24.4/en/application-monitoring/troubleshooting-applications
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