There is an option in the 'Circle of fifths' to simplify the chord names. If this simplified mode is activated, the circle of fifths shows the musical symbols according to your settings in 'General settings'-> 'Symbols' instead of the chords according to the music theory.
As the circle of fifths obeys the theory, it produces chords like 'G##'. The 'simplified mode' shows them as 'A' instead.