Why is the free disk space incorrect?

When i display info on the disk of my macbook air i get the following info showing that 395 Gbyte is available on a 250 Gbyte disk and none used.
Obviously wrong. What can i do to correct this?

Thanks, Simple and direct solution. I am a bit surprised as it shows that not all functions in MAC OS are well built. Do you think Apple will correct this in future, and are they already working on this?
Kind regards.

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