Check Blog Tags : when selecting the tags I got error messages that some tags where duplicated

Hello,

I'm creating this issue to continue the analysis of the duplicated tags; see comment #29 (comment 2681835)

More information in the description #29 (closed)

Issue: When creating a Blog post, there are some duplicated tags with the same characters and also some testing tags that shouldn't be available in PRO :)

Thank you!