Today when I read the News (news.php) I recieved a notice that my Gold Account would expire in three days; I found this odd, as I had not activated a Gold Account. I assumed it to simply be a mistaken notification sent to the wrong person and continued dancing for the Masquerade, but I have noticed in my Inventory (inventory.php) I do indeed have the 250 item limit of a GA. While I did happen to miss being able to log in yesterday, I didn't have a GA active the day before. Any idea what's going on, or how?

I have been using Mozilla Firefox 59.0.2, and as I do not share an account with anyone, I should not be logged into any other computer than this one (iMac, 2008; I'd prefer not to give out the OS unless necessary to this problem).

It's not an error. There's a post titled 'Thank you!' on the front page/news that states that everyone active in the last month is getting a GA for 3 days. (Except people who currently have a GA, who will be getting 10 extra days.) It's to make up for all the lag and such that's been going on lately.

As Terra said, everyone at least got 3 extra days for being active. Enjoy your free GA time!