Spectrogram rendering

Hi all, Is there anyone who can tell me what’s happening below? When I zoom in or out the yellow block in the spectrogram can disappear, get fragmented, … When I play this part of the spectrogram, some parts sound okay, others produce (giant) glitches and other parts, without these yellow blocks, can produce short glitches. Is my wav-file corrupt or is there a problem rendering the spectrogram.

No problems here. What OS and some specs on your computer would help.