Extracting sx , sy

Hi everybody,
I extracted ( sx, sy) of ALos-2 data that it is Dual-polarization (HH, HV). when I open mask-valid-pixel.file, I saw this photo,

I think it is not reasonable, do you have an idea about it? I was done in polsarprov software.

the valid pixel mask is just a binary raster consisting of 1 and 0. The valid pixel mask always looks like this after extraction.

Please study some tutorials first:

thank you so much, I will study it.