Huge gap in defence after player sent off

[velonce]

Playing as Manchester United 4-4-2.

After Vidic got sent off, I decided to substitute off Anderson (CM) for young Johnnie Evans as CB thus forming a 4-3-2. However, a huge gap arises in the defence as shown in the image.

I leaked two goals straight away. That's odd I thought, so I pulled Rooney back into midfield to form 4-4-1 but the gap was still there. I tried back arrows etc. and it was on zonal marking all the time. This shouldn't occur since I would expect my CBs to be smart enough to stay close to the lone striker. I thought I'd take it on the chin and the next obvious answer was to use man marking but I didn't get a chance since players from both teams were getting injured left right and center. (The opponents no longer even played a striker)

Match Stats (Ferdinand 3 months, O'shea 1 month)

Final Formation