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Less Classes than specified when Exporting Index Values and Rates as Polygon

I would like to classify NDVI index map into 10 classes using method Equal Spacing and than export resoults to Polygon Shapefile. Unfortunately after the export I get only 8 classes and empty spaces without any polygon in extremely values. It seems that I always receive two classes less than expected. The check box “Clamped” does not affect on exporting resoults at all.

Resoults in QGIS and settings of a Classification in PIX4D Mapper Index Calculator:

How to export all genereted classes into Shapefile?