Steps to reproduce the bug:
1. Login as admin. Create a project site through WorkSite setup ->New .
2. Add 'Web Content' tool to the new site. You can also multiple web contents to site. For example : 3 Web content pages
3. Archive the site using Site Archiver
4. Import the site to a new site using Site Archiver tool.
In the imported site, you can notice that each of the web content pages is created twice. so , if there was 3 web content pages in original site, then the imported site has 6 of them.