Metrics and Reports Confusion

I am kinda confused when it comes to interpreting some of the reports and correlating them to metrics.

In the trend report it looks like on March 16^th the VM CPU Effective demand jumped way up close to 80% of the allowable CPU util.   It looks like on Mar 2 and 9^th the VM CPU effective demand was down to 2 on average.

I am fine with that however if I throw in a screenshot of USAGE % over the last 30 days it does not look like this server is over trending CPU at all.  In fact it looks like what it is running today is about average.

Am I reading the report wrong in comparison to the USAGE % ?

I've attached screenshots of what I am looking at.