Happens with drums UI to me too i have a temp fix in place.
I placed everything exactly where i want it ALL windows not just bars alone.
Type /save_uisettings SERVERNAMEHERE_TempFix_eq2_uisettings.xml
Then make a macro and put in a command line add
/load_uisettings SERVERNAMEHERE_TempFix_eq2_uisettings.xml
This loads up my saved UI and places my bars back where they should be
No clue still why it messes up each time but i just click that macro on login and
I'm ready to rock and roll.