So looking at the figures, up to the end of last year, this is what he was receiving:
Payment for himself, plus dependant adult for you, plus 2 children = €389
Then they subtract the means from your income of €174, leaving him with €215
So far so good.
But now it seems they've capped your combined payment at the max rate for a family of your size. You can't get two full payments, and you only get half rate each for the children.
I would query with them if Maternity Ben is meant to be treated that way. If you were both on Jobseekers it would be correct, but I'm not sure its the same for MB.