So this has been going on for far too long.... By exposing this maybe they'll fix it. :)

There is a bug that you can login into the server at around 00:30 server time if i'm not mistaken in NY servers (because of the maintenance probably).

Some people do it constantly, in new servers they recover the EXP from the last day making them have more lvl than the others. They usually login and play till the maintenance.

There has been a post about some guys doing this, and funny enough it's the same guy here: https://forum-narutoen.oasgames.com/page/show-post-49957-1.html

Proof: (Server just opened) And further proof has been sent to support which i'll later post here as well.