Can you please search your phrase manager for setting_dbtech_dbseo_filter_chars_custom_desc and setting_dbtech_dbseo_filter_nonlatin_chars_desc and show me their contents here?
Also, is your entire database set up as UTF-8 as well? i.e. all databases, all tables, all columns within all tables, as well as the default character set? If not, then this will be the cause of your problem most likely.