Slope analysis of DEM in QGIS?

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I have very strange problem with the raster analysis. I have a DEM as a Geo tiff and I do a slope analysis in QGIS. I've done this many times and everything was ok but this time I received reversed values: 0 for max slope and 89 for min slope. I have no idea what is wrong. Geotiff was generated from .asc files and seems to be ok.

I suppose there is something wrong with the first Geotiff file.I took "native" .asc file and made slope analysis without a problem.After that I generated Geotiff from the Slope.asc and is also fine.



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