13-09-2016/11:38 AM
The jetpack GUI (tells you how many, of the 7 units of JP you have left) has been broken for a long time. It works very little of the time and it's a shame because it's a very useful tool, especially when doing something like gun toss and you need full JP. I have to assume it's some unfixable bug because this has been an issue for quite a while and everyone knows about it.
Plox fix
Plox fix