Hi there. I'm not sure if it's supposed to be a problem (at least the way you brought up the issue doesn't sound like there's a problem with that to me). "Activity last 7 days" is a calculation of your activity for the last 7 days―is there anything weird with it being 100%? I see that you have indeed been posting frequently and probably do a lot more on the forum, so wouldn't that be normal?
As for the one-month registration period, I was merely emphasising on the fact that you haven't been registered for a month yet, so it could be that the system is unable to calculate properly because you don't meet the required prerequisite. Though, if your activity keeps being steady at 100%, it may be harder to prove if it indeed was a bug or not. (I'm not saying it can't be a bug―it could very possibly be one―but I'll need concrete proof and see whether the problem can be reproduced.)