"Find Length Duplicates" doen't show the same length files

[Jerry2024]

As you may see in attchments, when I rank the file list by video length, there are a lot video files with length 3:59, 3:58, 3:57. But when I use "Find Length Duplicates", only 1 pair 3:58 duplicate files in result list.

I've set length dupe tolerance to 1 second by the following post instrution, but it still doesn't work.
viewtopic.php?p=49458&hilit=duplicate+length#p49458

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[void]

Please specify length_dupe_tolerance in milliseconds.

Please try length_dupe_tolerance=1000 for 1 second.

[Jerry2024]

Please specify length_dupe_tolerance in milliseconds.

Please try length_dupe_tolerance=1000 for 1 second.

It works now, thanks a lot, sorry for my stupid question