I don't mean to sound combative, but ...
What happened is that the "Last Week" data on 7/16/2015 is being used as the same data for this week's graph for the "Last Week" column. So effectively the "Last Week" column for 7/24/2015 is two weeks ago.
Not really, but I see why you would think so.
For instance, the anim1 numbers do
appear static for 2 weeks, because 1. (I repeat myself) these numbers change every day and 2. most graphs are made on Thursday night and do not contain any changes that happen on Friday. This week, I made the graph on Friday.
So you see things like:
Anim4 shows 17 days worth on the (Thursday) graph of 2 weeks ago, but by Friday the number had grown to 32!
By the following Thursday, that was knocked back down to where he started at 17 and by today, it was down to 8.
Art1 went 27d Thr / 30d Fri to 17d Thr / 26.5 Fri to 15d on the next Fri (today).
This effect is known as the "beta bounce" (ask Stunt about it). You'll see the same devs oscillate between two fairly consistent hi/lo values of bugs as you approach a release. Gradually, the oscillation shrinks as the 'found versus fixed' rate starts to improve. It looks like a bouncing ball gradually losing energy.
As each new feature, gun or map is added to the project, bugs spike. Devs hold back on a set of lesser bugs to attack more serious issues, making their personal bug counts oscillate between "all I can manage" and "the few I'll get around to".
You can see it on individuals and even the whole project:
This is the found versus fixed rate for the whole shebang. Note the classic bounce effect - 53 bugs found a week ago, 55 found this week. 51 bugs resolved a week ago and 77 resolved this week plus a batch of audio tweaks (that is the shift we look for as things begin to stabilize).
You can also see the peak of changes at the end of a week, like the 16th through the 19th. A week later, we're passing the same bug counts again, just a little better off.
When green is winning, life is good. That means you are getting closer. Soon, despite best efforts, QA will just find fewer bugs and fixes will overtake the bug count.
Again, I see why you might think so, but that is just what it looks like. The bounce. I can't be any more transparent than showing you the actual settings in Excel.