Part of record in silent

Hi everyone!
I have a record which I made in audacity (not imported or anything). And part of the record has silent spot although I can see wave forms there. And when I edit some other part near the “strange” one it show blank space.
Check it out

What is this glitch and can I fix it?

Audacity version is 2.1.3 on Mac OS Sierra 10.12.6 but the record is done on Windows 8.1 in Audacity 2.1.0