Specgram zooms when sampling rate resampled to lower

Hello,

I ve an audio wav file(original.wav) with 48000Hz sampling rate. I created spectrogram graph by using this command line:

[y,fs]=audioread('original.wav')
specgram(y)

after than i resampled my file and i did same method:

[a,b]=resample_number('i_wovel.wav',5500)
specgram(y)
%%
%my resample function:
function [y_new,Fs_new]=resample_number(audio_file,Fs_value)
% Code to read audio files
[y,Fs] = audioread(audio_file);
% code to resample audio
Fs_new = Fs_value;
% Take ratio from our old sample
[Numer, Denom] = rat(Fs_new/Fs);
y_new = resample(y, Numer, Denom);
end

After execution, this graph shown:

ANSWER

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Complete code for audio signal analysis

clc
clear all
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% load signal
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% data
[data,Fs] = audioread('test_voice.wav');
channel = 1;
signal = data(:,channel);
samples = length(signal);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% FFT parameters
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
NFFT = 256;    % 
OVERLAP = 0.75;
% spectrogram dB scale
spectrogram_dB_scale = 80;  % dB range scale (means , the lowest displayed level is XX dB below the max level)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% options 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% if you are dealing with acoustics, you may wish to have A weighted
% spectrums 
% option_w = 0 : linear spectrum (no weighting dB (L) )
% option_w = 1 : A weighted spectrum (dB (A) )
option_w = 0;
%% decimate (if needed)
% NB : decim = 1 will do nothing (output = input)
decim = 1;
if decim>1
    signal = decimate(signal,decim);
    Fs = Fs/decim;
   
end
samples = length(signal);
time = (0:samples-1)*1/Fs;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% display 1 : time domain plot
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
figure(1),plot(time,signal,'b');grid
title(['Time plot  / Fs = ' num2str(Fs) ' Hz ']);
xlabel('Time (s)');ylabel('Amplitude');

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

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Specgram zooms when sampling rate resampled to lower