This result is unusual, but it is possible. I am a criminal defense attorney and I've handled hundreds of felony offenses. While the departments of correction (DOC) of each state will typically NOT have the time served concurrently, it can happen. What needs to take place, and apparently did in your ex's case, is for the assigned prosecutor in each state to communicate with the other. They will discus their cases, the strengths and weaknesses of each, the desires of the victims, the probability of conviction and even the history and health of the defendant. Sometimes it simply makes sense to resolve the cases in this manner.
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