Problem with values while reprojecting raster

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I downloaded a series of Landsat 8 Images and I will be using QGIS to process them.

The projection of 2 of them are incorrect, so I used "Warp tool" in QGIS to change them.

The resulting rasters DO present the new assigned projection, but the pixel values change dramatically (originally being between 0-0.5 in the original raster and changing to 0-29790).

What can I do to reproject them without modifying the original values?





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