Sometimes you can be released prior to finishing the minimum sentence. My advice would be to contact his probation/parole officer as soon as possible to make sure he is following all the requirements.
I may be misunderstanding your question, but yes, under Structured Sentencing, a convict given an active sentence does have to serve at least the minimum sentence.
I am not sure what you mean when you say that his "Probation/Parole/Post Release Status is set at Active." Has he been release from custody? Is this some box you saw checked some where (possibly one that has been mistakenly checked? Without more information, it's hard for me to me to give you meaningful answer.