Graphs and monitoring differs from real memory usage?

Hey, i hope you guys help me out with this issue.

Currently i have a 1gb ram droplet with ubuntu 16.04.2 os.

On my droplet dashboard, the memory graphs says that im using about 71.8% of my ram. See: Dashboard graphs image

But inside my droplet, i run a command to display the current memory usage (%) and the result is this: Inside droplet

As you guys can see, mysql are using 26.6% of my ram, and my java webservice is using 32.2, and some other process that dont mean almost nothing to the vm. At the memory graphs, it stills going up and up, but at my droplet, it still the same. Java at 32.2% and mysql at 26.6%

Maybe im looking at the graphs wrong? Or its really a bug in the dashboard?

Thanks.