Site Categories Landing Page Categories snafu

Display issues for children categories

Landing Pages Categories Display Option
Parent grid > Children dropdown (select) nested
dropdown shows but not clickable
getting javascript error
Uncaught SyntaxError: Unexpected token - line 251

Parent gridd > Children dropdown (select)
no error, but shows children not in a dropdown, not clickable

this site is behind under construction can send credentials but really don't want to

problem persists with Twenty Fifteen theme