Does it Happen?
Yes, Usually because the leader conducting the initial counseling is inexperienced.
Should it Happen?
No, you should not receive two counseling statement for the same offense. Typically this is done when the first counselor fails to conduct a proper counseling or leaves out key elements that are required for the counseling to meet legally sufficient.
If your matter is referred to JAG they will typically take one of the counseling statements not both so that they avoid any complications.
Is it Right?
Is it right? Not necessarily
What can you do about it?
Not much, Soldier up, disagree if you want to on the back of the second counseling and keep both copies of each counseling. I know of no regulation or FM that covers this situation.