NDVI- Values change after exporting the file to GeoTiff and opening it on QGIS

Hello, I am having a problem exporting a NDVI file to GeoTiff format. Once I open the new file in QGIS, the values in the NDVI have changed. Does anybody knows how can I fix this? I would really appreciate the help.

You can simply open the img files inside the data folder aa rasters in SNAP. No need for conversion to GeoTiff. This often alters the data type (float to integer) which causes different values.