I believe it’s a glitch. It’s going based off of what it’s seeing as the beginning of your subscription period. Most likely September 20 would be the 1 month mark. It’s not differentiating between the trial period and a full monthly subscription. That said, I’m going to suppose it won’t connect for you if you try to use it unless you Renew Plan.
That’s my assumption anyway. At least things look good. If you see there’s a charge, then just tag me (@saoiray) here and I’ll see if we can’t get it looked at. But I’m assuming you’ll be fine.