landsat 8 - Landsat8 NDVI values not in the -1 to 1 range

I was trying to create an NDVI from Landsat8 OLI image from July 2013. I ran DOS1 and TOA. The values range up to 3. The original files were downloaded from EarthExplorer(EE), ran on QGIS and Multispec. The original data was downloaded again from EE and then ran only in QGIS (band calculator).

What am I doing wrong?

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I switched to a landsat 5 image and i am having some problem. After the TOA and DOS1, these are the results for visible Red:'RT_LT50010862008320COA00_B3.sta' Number of Bad Lines = 0 Total Number of Pixels = 2,969,703 Histogram Summary Table First Last Line First Last Column Line Line Interval Column Column Interval 1 7251 20 1 8181 1 Channel Data Range Mean Median Standard Description Deviation 1 0.0075 to 0.6560 0.0409 0.0432 0.0294