What's wrong with this picture?

For testing and color-check I bought one skein of  Debbie Bliss Rialto Chunky.   Rialto Chunky has approximately 66 yards per skein. 

What is wrong?  

When I buy yarn short on yardage the last thing I expect is to hit a knot not even half way into the skein.  The pattern I am testing requires 13 skeins of this yarn.  I like the yarn, but I want to keep adding yarn to a minimum.