Forum:Co-op weapon unlock glitch

I was just getting into the co-op campaign and i was just about to unlock the MP7 after finishing the whole campaign. I left off playing BF for about a two weeks to have crack at teh Portal co-op campaign again. So i came back online in the BF community in about two weeks and when i went to "my soldier" my progress bar ahd skyrocketed to halfway unlocking the G3A3. Can anyone shed some light on this?