I use Tiddlywiki 5.1.22 on node.js v12.14.1.
I deleted them all without impact so far. I'll watch if they reappear.
It will be interesting if they come back.
Any idea why they were created?
In normal cases, TW tries to "protect" content. So if you create a new tiddler and the tiddler already exists, a new number will be appended. ... BUT this should only happen for "user created" content. ...
So I think you did some experiments, may be with the
ActionCreateTiddlerWidget ... If some variables are not set right, and you try to manipulate the $:/StoryList tiddler it might be possible to create several of them. ... But that's just a guess.
-mario