Conceeding goals from through balls

Hi.

I'm playing a save with Leyton Orient. I've promoted from League Two to League One, and I'm leading the League with 13 points down to Derby beeing second.

14 games left of the season.
I'm still playing in the FA cup (Fourth round)
I'm still playing in the Papa Johns Trophy (semi finals)

I'm playing 4-2-3-1 WIDE and with Gegenpress.
Gk is GK Defensive
DRL are WB
DC BPD and CD
MC BBM and BWM

But I'm conceeding a lot of goals from through balls?

Anyone who has an advice?

It helped to set the keepers role to sweeper keeper...