[1.64][Bug][SMP] jetpack duplication glitch

I apologize I do not know how to get a log but here is a video I uploaded on YouTube perhaps some sense can be made from it. This seems like a major issue and if it's known and there is something I am doing wrong please let me know Thank you. Here is my video:

http://www.youtube.com/watch?v…DskKHdonC0qzYRZT0yGBfAToq

I am using the recommended build: 1.3.2.1 - thank you for your response