Could anyone explain why BTC with 158k posts at the second place whereas KCG~ with only 10.3k posts but at the first place in trending statistics of twitter? (whereas I could not get any reason how and why USDT got more posts than BTC still it is at the third place).
Here I doubt about photoshopped image from a bitget shiller.
Welp, you've just answered your own question and that's possible that it's edited and they've made that just to be posted here that there's an ongoing event that as big as the trend for BTC's new ATH.
To prove this I tried displaying the same trending, leaderboard, number of tweets, and categories as an example. Take a look at the image below:

So in my opinion although a larger number of posts doesn't always lead to higher rankings, it usually depends based on user x own search algorithm or the posts they frequently visit, including factors like who they follow.
Or if you have an x account you can also check it directly.
Thanks, so whether it is edited or not. That means that they've been in the trend and we cannot change that fact. So, let's just focus on the what's actually trending and that's with Bitcoin reaching $118k. And I think that to make something trending, it should have a lot of engagement, therefore it's not only about the posts but also the retweets and comments that are on that actual post. So, that might help why one topic is on the trending in X, there's something with their algorithm but these trends don't last in a day and there's a new one next.