Unexpected multiple sound sets

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When copying all 36 sound files (_!DEMOA plus _!DEMOB), the following soundset names appear as selectable (see screenshot):

To better understand what is happening here, it is necessary to narrow down the reason for such behavior.

These are the copied sound files:

Side note:
This may not be relevant, but if one of the soundset names are selected and then the play button is clicked, no sound will play.

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Deleting the following sound files:

results in:

This fixes the issue.

Further research is required to add these sound files to the player characters' soundset.

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The following can be found in another repository:
"Distribute your converted sound files between the sounds and the wav folder, with files having a single character suffix copied to cd_soundsets\sounds and files having a dual character suffix copied to cd_soundsets\wav."
Source: https://github.com/Gibberlings3/EE_soundset_tool

Furthermore:
"Everything listed in the Simple Soundsets section of the first post here goes to the sounds subfolder, everything listed in the Expanded Soundsets section goes to the wav subfolder. The underscores in the Expanded section are part of the suffix and are the second character."
Source: https://www.gibberlings3.net/forums/topic/34560-adding-soundsets-to-the-ees-using-the-ee-soundset-tool/?do=findComment&comment=308217

Those information need to be tested.

[Incrementis]

Following the logic in the previous comment resolves this issue.