ArcGIS Desktop and Pro read incorectly one band raster as two

Question

This seems silly, but I have spent too much time searching and making my life over difficult -meaning I am doing something wrong: 
I have a TIFF file that is read correctly as one band by tools such as Rasterio, and other Python libraries, but both ArcGIS Desktop and Pro read the file as two-band (R+G), why!? Do I need to explicit request to import the file as one band? And if so how?
Also, is there something missing in the file that makes Esri tools miss the fact that the file is one band?

icypy · Answer

So the problem was indeed that ArcGIS reads the alpha band as the second band (green - in RGB) which caused the confusion.

ArcGIS Desktop and Pro read incorectly one band raster as two

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