After you have worked with the program awhile your bms will come to be a normal fluffy medium brown that floats in the toilet.
While you are working with the program you may have quite a bit of variety in shapes, colors and quality of stools as various aspects are eliminated.
Right now I wonder if your stools are liquidy because you are blocked and only the liquid is coming out as in an impaction or encoparesis. Continuing on the program will work to break up this blockage, if indeed that is what is happening. So keep working on the program.