This makes no sense. You state that you're on probation for weed. That's not something that you're going to be sentenced to prison for. You state that you have a new PO and you did have contact with the original PO prior to you failing to report. Then, you state you're not on probation but, somebody told you that you were.

In my opinion, no, you should definitely NOT be worried. This has to be a poorly constructed, made up scenario.