change the number of posts required to change level.

It's funny that a rather lengthy post from the Creator, intended to explain the inconsistency, actually explains nothing... :) What's the point of so many letters and numbers if the message doesn't answer the question: why? :)

I can only assume one thing: previously, the first level was reached after one post and was supposed to be maintained until 25. But in reality, after the second post, the player received the second level, after the 26th post - the third level, and so on. That's the only explanation that comes to mind. There isn't another.

Added 2 minutes later

If previously, from 750 to 1000, it was level 8 (for example, I had an Archmage)
Now, from 750 to 1000, it's level 7 (an ordinary Mage)

750-1000 is indeed the seventh level - if you look at the scheme. And if you go back (from bottom to top on the scheme), it becomes clear that one post gave you level 1, 2-25 gave you level 2, and so on. This is just an assumption, otherwise - I can't explain it... :)