MATLAB: Getting shifted frequency curves instead of normal ones

curve fittingfrequencyplotplotting

Why do I get somehow displaced curves ( see first picture) that should normally be an unshifted curve?(see the second picture)
The frequency is calculated through given frequency values and a time column
The code looks like the following
    nexttile
    Fd1 = double(split(string(fdim1(1:end-1)) , ","));
    Fd1 = Fd1(:,1);
    plot(timefdim1(1:end-1),Fd1);
    xticks([timefdim1(1) timefdim1(end-1)]);
    yticks([Fd1(1) Fd1(end-1)]);
    title('dimfrequency 1')
    xlabel('Uhrzeit in [HH:MM:SS]')
    ylabel('Frequenzintervall 150kHz - 80 MHz')
    
    nexttile
    Fd2 = double(split(string(fdim2(2:end-1)) , ","));
    Fd2 = Fd2(:,1);
    plot(timefdim2(2:end-1),Fd2);
    xticks([timefdim2(2) timefdim2(end-1)]);
    yticks([Fd2(2) Fd2(end-1)]);
    title('dimfrequency 2')
    xlabel('Uhrzeit in [HH:MM:SS]')
    ylabel('Frequenzintervall 80 MHz - 1 GHz')
    
    nexttile
    Fd3 = double(split(string(fdim3(3:end-1)) , ","));
    Fd3 = Fd3(:,1);
    plot(timefdim3(3:end-1),Fd3);
    xticks([timefdim3(1) timefdim3(end-1)]);
    yticks([Fd3(1) Fd3(end-1)])
    title('dimfrequency 3')
    xlabel('Uhrzeit in [HH:MM:SS]')
    ylabel('Frequenzintervall 1 GHz - 2,7 GHz')
    nexttile
    F1 = double(split(string(fbll1(1:end-1)) , ","));
    F1 = F1(:,1);
    plot(timefbll1(1:end-1),F1);
    xticks([timefbll1(1) timefbll1(end-1)]);
    yticks([F1(1) F1(end-1)]);
    title('bllfrequency 1')
    xlabel('Uhrzeit in [HH:MM:SS]')
    ylabel('Frequenzintervall 150kHz - 80 MHz')
    
    nexttile
    F2 = double(split(string(fbll2(2:end-1)) , ","));
    F2 = F2(:,1);
    plot(timefbll2(2:end-1),F2);
    xticks([timefbll2(2) timefbll2(end-1)]);
    yticks([F2(2) F2(end-1)]);
    title('bllfrequency 2')
    xlabel('Uhrzeit in [HH:MM:SS]')
    ylabel('Frequenzintervall 80 MHz - 1 GHz')
    
    nexttile
    F3 = double(split(string(fbll3(3:end-1)) , ","));
    F3 = F3(:,1);
    plot(timefbll3(3:end-1),F3);
    xticks([timefbll3(1) timefbll3(end-1)]);
    yticks([F3(1) F3(end-1)]) 
    title('bllfrequency 3')
    xlabel('Uhrzeit in [HH:MM:SS]')
    ylabel('Frequenzintervall 1 GHz - 2,7 GHz')
Thanks a lot in advance for the help.

Best Answer

The time vectors were stored in categorical datatype (bad choice). Therefore, you were getting that unexpected plots. Try the following code. I have only added lines before the plot() statement.
nexttile
Fd1 = double(split(string(fdim1(1:end-1)) , ","));
Fd1 = Fd1(:,1);
timefdim1 = duration(string(timefdim1));
plot(timefdim1(1:end-1),Fd1);
xticks([timefdim1(1) timefdim1(end-1)]);
yticks([Fd1(1) Fd1(end-1)]);
title('dimfrequency 1')
xlabel('Uhrzeit in [HH:MM:SS]')
ylabel('Frequenzintervall 150kHz - 80 MHz')
nexttile
Fd2 = double(split(string(fdim2(2:end-1)) , ","));
Fd2 = Fd2(:,1);
timefdim2 = duration(string(timefdim2));
plot(timefdim2(2:end-1),Fd2);
xticks([timefdim2(2) timefdim2(end-1)]);
yticks([Fd2(2) Fd2(end-1)]);
title('dimfrequency 2')
xlabel('Uhrzeit in [HH:MM:SS]')
ylabel('Frequenzintervall 80 MHz - 1 GHz')
nexttile
Fd3 = double(split(string(fdim3(3:end-1)) , ","));
Fd3 = Fd3(:,1);
timefdim3 = duration(string(timefdim3));
plot(timefdim3(3:end-1),Fd3);
xticks([timefdim3(1) timefdim3(end-1)]);
yticks([Fd3(1) Fd3(end-1)])
title('dimfrequency 3')
xlabel('Uhrzeit in [HH:MM:SS]')
ylabel('Frequenzintervall 1 GHz - 2,7 GHz')
nexttile
F1 = double(split(string(fbll1(1:end-1)) , ","));
F1 = F1(:,1);
timefbll1 = duration(string(timefbll1));
plot(timefbll1(1:end-1),F1);
xticks([timefbll1(1) timefbll1(end-1)]);
yticks([F1(1) F1(end-1)]);
title('bllfrequency 1')
xlabel('Uhrzeit in [HH:MM:SS]')
ylabel('Frequenzintervall 150kHz - 80 MHz')
nexttile
F2 = double(split(string(fbll2(2:end-1)) , ","));
F2 = F2(:,1);
timefbll2 = duration(string(timefbll2));
plot(timefbll2(2:end-1),F2);
xticks([timefbll2(2) timefbll2(end-1)]);
yticks([F2(2) F2(end-1)]);
title('bllfrequency 2')
xlabel('Uhrzeit in [HH:MM:SS]')
ylabel('Frequenzintervall 80 MHz - 1 GHz')
nexttile
F3 = double(split(string(fbll3(3:end-1)) , ","));
F3 = F3(:,1);
timefbll3 = duration(string(timefbll3));
plot(timefbll3(3:end-1),F3);
xticks([timefbll3(1) timefbll3(end-1)]);
yticks([F3(1) F3(end-1)])
title('bllfrequency 3')
xlabel('Uhrzeit in [HH:MM:SS]')
ylabel('Frequenzintervall 1 GHz - 2,7 GHz')
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