the first looks normal. the 21kHz drop in the 2nd and 3rd is strange. 256kbps cbr mp3 cuts off around here (see
here) but your shows have some bit of distortion above the line (uncharacteristic) and I can't spot mp3 artifacts. perhaps it was pitch correction?
not certain.
anyhow, I can't point to direct evidence so 'innocent until proven guilty...'
the 2nd and 3rd are a little suspicous for sure... perhaps see if there's any variant filesets for these two dates that might be free from the drop at 21kHz.
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