There are two ways that I know that can create a double set of clip names - clip namesfor Left and right tracks
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Make a stereo track from two mono tracks - this can result in different clip names in either channe;
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Import an old AUP stereo project into a newer Audacity version that uses the AUP3 consolidated database.
Both of these are logged as bugs on the Muse GitHub bug tracker. But there is little or no progress on this as the developer involved thinks clip names per channel is a cute idea (I happen to disagree).
See:
Simplify asynchronous stereo tracks #2722
https://github.com/audacity/audacity/issues/2722
Opening (importing) an AUP project gives a stereo track two un-named clip-handle drag bars #2618
https://github.com/audacity/audacity/issues/2618
Make Stereo Track can result in a track with different clipnames for each channel #1850
https://github.com/audacity/audacity/issues/1850
Peter