It's simple. Your probably just confused, because you possess all of knowledge from previous PWA story-lines. When I signed up for PWA, I signed up as Sanders, but after a few weeks, I felt as if I had nothing more for the character. Thus, I came up with the story-line centered around a new character named Andrew Reynolds, who had posed as Sanders for credibility. However, I went back and read all of my roleplays from PWA and decided to switch back, mainly due to the fact that I really wasn't coming up with well-written material for Reynolds.
Quick Summary (Kayfabe):
Sanders that joined before was actually Reynolds. Sanders is now debuting for the first time.