Ingredient change in Blue Spa Select?

I was just mixing my cats food and noticed that the Blue Spa Select formula seems to have changed. I had bought the Indoor health one for the grain inclusive and BG Chicken for the Grain Free. Well I looked on the label of the spa select and I noticed Dried Cellulose on the ingredient list. I associate any type of cellulose as a filler in the low end foods, not in Blue. Also the fiber content went up to 4.5% when it was 4 before. I don't get anything higher than 4% fiber because I have a megacolon kitty that does better on lower fiber. I know there was no cellulose before because I would have never put it in my rotation. It kinda makes me mad though because I pay quite a bit for my cats food and I expect it to be good, especially from a company like Blue. It isn't as big a deal for me because I mix it with another food and rotate it out every month or so, but still not good.