>This is normal. The values vary from 0,0,0 to 255,0,0 in the first column, then from 255,0,0 to 255,255,255. I did not included 0,0,0 and 255,255,255 rows (first and last row) into the table because this is a waste of space. That is why you see that difference. Grey colours are in the last column, where all R, G and B components equal.

So, basically, where there is only two values, that means the last one is 0.