My user page is: https://e621.net/user/show/9770

Now when you click on comments number, it should show my comments only, but look what happens here:
https://e621.net/comment/search?query=user%3ANSFW

It shows all comments with the acronym "nsfw". Mostly stuff I didn't said.

Few time ago, it didn't work like this.

Sorry if I'm posting on wrong place, but I just couldn't find the right place to report this.

Weird, it's not displaying your comments page, but rather the "Search for myself in comments" page that's supposed to be accessed through your My Account list. Are you sure you're doing this from your profile page instead of My Account?

There's a difference in URLs too, I'll show you what I mean with mine:

https://e621.net/comment/search?user=Jugofthat <- Comments
https://e621.net/comment/search?query=Jugofthat <- Search for myself in comments

See? The difference is the use of "query" instead of "user", meaning it will search for every instance of your username appearing outside of your own posts. Your link says query. Usually that will only mean it showing others directly quoting you, but since you have a frequently used acronym for a username, this is what happens. Every mention of NSFW gets dumped there (or it should, but then I only see 7 posts on that page, which seems impossibly low).

_{Hmm, now I'm not so sure anymore.}

The user:username syntax was removed. Use the search options link to search by username instead (it'll show as?user=nsfw in the url).