About reflectance of sentinel-2 image

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Pixel values changing after using SNAP graph

Hi, I am automating my process for getting 9 bands at 20 m and an additional 20 indices from sentinel-2 images. But I observed the final bands after the automated process shows the pixel values very less than that of original atmospherically corrected pixel values. For example, the B3 band(atmospherically corrected) shows the highest brightness value of around 6000 but the same band after going through the graph attached shows the highest value of 0.9. What is going wrong with this process? Fu…