My X actually told me that he calls me when there are discipline issues b/c he is not with them enough to discipline them and is not comfortable doing so b/c it would ruin their time together. He is a total idiot. Luckily, my kids don't require much discipline, but they will run all over him when they get a bit older, which is what I told him.
You cannot do anything about it, so try to let it go as best you can.
XXX