It looks as though you are not calculating and displaying your fft correctly. You need to display only the left half, and you need to calculate and include the frequency vector. The current documentation (in R2015b) is not as straightforward as that in previous versions, so see the R2015a documentation for fft here, particularly the code between the first two plot images.
Guessing here, but see if changing part of your code to this works:
FFTKJER = fft(bCall)/L;
Fv = linspace(0, 1, fix(length(FFTKJER)/2)+1)*fs/2; % Frequency Vector
Iv = 1:length(Fv); % Index Vector
...
plot(Fv, abs(FFTKJER(Iv)));
Note: This is untested code, but should work.