Shade between lines in log-y scale not properly plot

Hi, I have a similar issue, my filled area (figure 2) is not as expected, I don´t understand what's wrong. How could I fix it?

load data_ecdf
figure(1) % just to view the expected filled area
semilogy(eOut.psSST, eOut.sSST);grid on;ylabel('mg/L');hold on;title('SST')
semilogy(eOut1.psSST, eOut1.sSST);hold on
semilogy(eOut2.psSST, eOut2.sSST);
legend('empirical','down','up'); hold off

idx = eOut1.sSST>0 & eOut2.sSST>0;          % Eliminate Negative & Zero Data

figure(2) % uncertainty band
fill([eOut1.psSST(idx) fliplr(eOut1.psSST(idx))], [eOut1.sSST(idx) fliplr(eOut2.sSST(idx))],[.9 .9 .9], 'linestyle','none')
line(eOut.psSST, eOut.sSST);grid on;ylabel('mg/L');xlabel('probability');title('SST')
set(gca,'YScale','log')

Answer 1

[Chunru]

load data_ecdf
figure(1) % just to view the expected filled area
semilogy(eOut.psSST, eOut.sSST);grid on;ylabel('mg/L');hold on;title('SST')
semilogy(eOut1.psSST, eOut1.sSST);hold on
semilogy(eOut2.psSST, eOut2.sSST);
legend('empirical','down','up'); hold off

idx1 = eOut1.sSST>0 ;
idx2 = eOut2.sSST>0;          % Eliminate Negative & Zero Data
figure(2) % uncertainty band
semilogy(eOut.psSST, eOut.sSST); hold on
%eOut1.psSST(idx)
fill([eOut1.psSST(idx1); flip(eOut2.psSST(idx2))], [eOut1.sSST(idx1); flip(eOut2.sSST(idx2))],[.9 .9 .9], 'linestyle','none')
grid on;ylabel('mg/L');xlabel('probability');title('SST')
set(gca,'YScale','log')