It's from someone's site. I've used her patterns before. This one is an irregular chevron type pattern, this one:
http://stitcheryprojects.com/2014/02/07/m-and-w-ripple-blanket/
Finally, I went back to the page and read the comments. Others were having the same trouble as me so I don't feel so dumb, but I should have read the comments b4 I did it twice and frogged it twice, LOL. It just didn't seem right to leave so many stitches at the end of each row simply not done. Now, her answer to the other folks says that the edges will appear rippled, while the photo does NOT appear that way to me. I guess since I'd used her patterns before, even a ripple one, with no trouble, I didn't think to check to see if there was trouble in the pattern had by other crocheters. Now, it's several balls of yarn and I don't think I'll do it again. Might stick to a regular ripple pattern. I like the ripple/wave afghans and was doing this in my high school colors, which happen to be the colors of the high school my sons graduated from (different school than me, different county, same state), orange and blue (or mango and iris, per Red Heart With Love color names).
I usually do not like ripple crochet, but that is the best one I have ever seen.