Reproduce:
Create some taxonomy terms
Set up autocomplete deluxe widget on tags field in any content type (i used article)
Edit an article
Add three values (tags) to the autocomplete field
Remove the middle one
Reload the page (without saving)
Result:
Now there will be one tag left wich is a combination of the first and last tags you added...
Probable cause:
I believe this is probably caused by a javascript regex.
Closed: outdated
2.0
User interface
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It's likely this issue predates Contrib.social: some issue and comment data are missing.