I achieved the Expert level in a recent Div.3 competition. Codeforces Round 900 (Div. 3)

As a Chinese student, my first encounter with a computer after the competition was at 22:00, 27th September 2023 (UTC +8). However, I noticed that my name was still displayed in green at that time. When I checked my profile, I saw that I already had a rating of 1631. On the rating chart, my rating line was drawn in the blue range. My max rating was already 1631, marked as Expert with a blue color. However, my name was still displayed in green.

I used a translate script. But I have close all of the scripts but nothing happened. I am serious, and I'm not using F12.

However, on codeforces.com, I had the chance to see my name turn blue and view my rating on my profile. I was puzzled, so I went to mirror.codeforces.com to observe. Unfortunately, I couldn't access it, so I switched to codeforc.es for observation. On codeforc.es, my name had already turned blue and I had been given the Expert rating. No matter how I refreshed the page, my name remained stably blue, unlike on codeforces.com where it frequently changed during refresh.

I was considering whether the anti-cheating system caused the color change in my name. By the way, during a previous Div.4 competition Codeforces Round 898 (Div. 4) where I gained a significant amount of rating, my initial rating remained at 1395. But now when I checked my rating table, I found that my pre-competition rating was already 1406. This raised some questions from my peers.
I would like to know how long the anti-cheating system on Codeforces generally runs at a time.