You are not alone.
I have just found Bank Mode changed to white on black instead of black on white titlebar. i.e. sort of DARK mode for Bank mode.
This has occured here only in past 2 days, and not due to browser version update.
I know some users have been crying out for a DARK mode, but this is indiscrminate and unwanted change, that has no setting to change back.
What is going on?