Why are the MFCC coefficients different for the same window?

Question

Python

Please explain why the code produces the following results.
There is a wav file with a frequency of 48000 Hz, I extract Mel-frequency cepstral coefficients from it, a window and an offset of 240 samples (from the logic of 50ms * 48000).

def mel(wav_file):
    samples, sample_rate = librosa.load(wav_file, sr=None)
    mfccs = librosa.feature.mfcc(samples, sample_rate, hop_length=int(0.005 * sample_rate), n_fft=int(240))
    mfccs1 = librosa.feature.mfcc(samples[0:240], sample_rate, hop_length=int(0.005 * sample_rate), n_fft=int(240))
    print(mfccs[0][0], mfccs[1][0], mfccs[2][0], mfccs[3][0])
    print(mfccs1[0][0], mfccs1[1][0], mfccs1[2][0], mfccs1[3][0])

At the exit

-814.967 19.22025 13.9679365 8.873832
-984.62683 -13.866039 1.2349255 15.176905

Why are the coefficients different for the first window?