I had exactly the same problem as soon as patch 14.1.4 was released! Was unbeaten, top of the premier league with Liverpool in January first season - then BANG! New patch, cannot defend at all!
I found that I had team instructions set to "fluid" and "Much higher line" and players set to "roam from positions" ... I set the team to Rigid, Deeper line but KEPT roam positions, and all appears better!