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Yea it sounds like there was a misunderstanding of how the Counter Offensive Stratagem works in relationship with the EC Legion Trait.

We have two players, A and B, and A and B each have 5 units engaged in the fight phase.

Normally every unit who charged goes first. There is a generic Chargers Go First rule in 40K. Lets say its player A's turn and he charged successfully with 3 units. First all of the chargers would go, then the player whose turn it is would select a unit, and players would alternate selecting units until all eligible units had been chosen. So it would look like this

Ac Ac Ac A B A B B B B

Now lets take Counter Offensive. On that turn where A charged in with 3 units, B can use the Counter Offensive Strategem to interrupt, so after one of A's charging units has resolved its attacks, B can interrupt with Counter Offensive to get in there. But B can only do this once, because a strategem may only be used once per phase.

Ac Bs Ac Ac A B A B B B

Okay. Now lets say B is playing Emperor's Children. EC Legion Trait allows them to always go first. Unless the opponent has a similar special rule -> or Charged. In which case the EC rule tells us to alternate. So if A charged with 3 units the match would look like this.

Ac B Ac B Ac B B B A A

Note that this unless B wants to interrupt with something without the chapter tactics (like a Defiler), B will never need to use Counter Offensive to "interrupt"

If B charges A, then the Counter Offensive can be used to interrupt one of Bs charging models after it used its attack. If B didn't charge, A is inelligible to use the Counter Offensive Strategem even though all of Bs attacks will be resolved first.

If the DP is the only unit that charged Counter Offensive would do nothing. Where you need to be careful is if you charged in with a squad of Noise Marines and the DP. The opponent will be able to interupt between those two activation. So on turns where you charge multiple units in, think carefully and plan your attacks so that your important units can't get gutted before they can swing.