Loudness meter not detected

Hello There,

I have a weird issue.

I wanted to control my loudness level on some sounds. All was working fine, loudness was detected correctly, but for a group of sound, it's impossible to make the loudness meter work. The ITU Column remains empty.

I tried to delete all, refresh and stuff, but this group of sounds keeps having the ITU column empty.
Is there something I missed?

Thanks !