The DMC will block shots from the wingers, after all, the shots are aimed at the centre where the DMC is naturally is.

Like I implied, it COULD be that you had ineffective wingers who didn't really do any damage to the DR/L AND his DMC was blocking not only shots from the wings but also making tackles in the middle.

Once you moved your winger to the middle as an AMC, one v one with the DMC, he might have had more luck going past the fella. Whoever he was up against prior to that on the flanks did a pretty good job keeping him quiet.

We can only assume tht's wht happened. Take a look at the final rating and you can rough get an idea on what happened.