First, there's a very probable bad configuration of what DB from SQL the website should use.
Me_MuOnline is not always used by your server files. Check what's the main DB used.(MuOnline or Me_MuOnline)
Probably your main DB is MuOnline. So you need to check the website configurations first and if that's incorrect, set the correct DB name.
The main DB used by server is having tables as: Character, memb_stat, memb_info
Also, query these tables with a SELECT * FROM table_name and see what's the data inside them. The correct table would have your account informations according to that table.