Described [[ LinguaLibre:Chat_room#About_the_exclusion_of_already_recorded_words | here ]]. I recopy here the message:
This morning, I start a recording session and LL proposes me words that I registered two days ago. For example, I already registered Belorusino two days ago, but it does not disappear when I click exclude words already recorded. And notice the two versions of the file, which I already re-recorded it.