Why do raster band values have different values than raster statistics in QGIS?

I am working on a raster file (1 Band).

According to the raster metadata, my minimum value is 0 and maximum is 7458. This seems to be confirmed by the Style options that return some category values in the value range mentioned above. In addition, these numbers make total sense with the nature of my data.

However, when I use the "Identify Features" tool, I get some values completely out of the range (these values look like this one generally: 4.5761380462188e-315).

I don't understand why and it's a problem because I would like sometimes to get the value of a single pixel. Do you have an idea why I have this discrepancy between the Identify Feature tool and the raster statistics?

I use QGIS 2.2.0-Valmiera on Windows 7.