90 Day Vitem V Question

Quick Question on the 90 day vitem V

Is the Visa valid for 90 days from the date of issue

Date of Issue:  13 July 2017

When I arrived in Sao Paulo on July 26th - the Federal Police Stamped my Visa with 78 Days.
Did I lose 12 days from the date of issue to date of arrival?

I have had consulate staff tell me that the visa is good for a year, 90 days, and 90 days from date of issue.

Any clarification would be greatly appreciated.

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