hello Sergio
If you use 16bit inputs your images are tonemapped to 8bit and during this process colors may change - this is bug on our side.
We have integrated custom HDR/16bit to 8bit tonemapping algorithm for better alignment and meshing (experimental).
In previous version a default conversion provided by your CodecPack was used that was often not optimal for alignment and meshing.
That means that you need to convert your 16bit images to 8bit in your preferred way outside of RC and use them for texturing. We always recommend to do that as 8bit images are much smaller and RC can process them faster.
This will be fixed in future release.