When adding tags to a blog post, it is automatically creating several links out of these tags that link to nothing and create a 404 http status code. Any idea why these links are being created when they do not lead to a page? And how to fix this? See example below:
To begin troubleshooting you can also try temporarily switching to a default theme like Twenty Seventeen and then repeating the steps that cause the issue. With a default theme activated, when adding tags to a post, does the issue persist? This will let you know if the problem is theme related.