Bad luck mostly. Not sure how much you can do about it. 10 team league everyone has pretty loaded teams, so not sure what kind of trades you can do. You are selling low on a lot of those guys.
Aaron Rodgers is out of sync on a lot of plays this year, but you have to keep him.
Andre Johnson is getting way less targets that anyone expected. Like 30 through 5 games, awful for #1 receiver.
Dez and Andre are dropping balls.
Cowboys O-line is struggling, so Murray is struggling.
New Saints coaches haven't really figured out how to get Sproles involved consistently
Jackson and Cobb are probably decent for your league
Basically, I think for a 10 team league, you just didn't end up with a very good draft.