Depending on the situation, your son may be able to work something out re: sentenced to "time served" on the probation violation issue, if I understand your facts and question correctly. Notwithstanding, I advise that you contact a criminal defense attorney to see if maybe someone with the court or somewhere else incorrectly processed the paperwork, etc.. Good luck.
It sounds like he had a hold on him from the other jurisdiction. You should hire an attorney to get this cleared up for him.
James L. Yeargan, Jr. is licensed to practice law in the State of Georgia. All information given is based only on Georgia law, and is not directly applicable to any other jurisdictions, states, or districts. Any answer given assumes the person who asked the question holds a Georgia Drivers License, and this license is not a commercial drivers license (CDL). This response, or any response, is not legal advice. This response, or any response, does not create an attorney/client relationship. The response is in the form of legal education and is intended to provide general information. Any state specific concerns should be directed to an attorney who is licensed to practice law in that respective state.