With 13 man staffs and injuries up the yazoo, it's not really surprising.
With a 40 man roster, it still seems like a lot.
This adds some explanation:
10-12 On IL: Crawford, Sandoval,Hendriks, Perales, Houck, Dobbins, Fitts, Criswell, Winckowski, Guerrero (back from IL: Murphy, Moran)
4 No longer on team or 40: Buehler, Newcomb, Burdi, Fulmer, Stock