Strange Redirects from google after sh404sef plugin + virtuemart

Question

This site couponviaggio.it it's a travel company e-commerce site, configured with Virtuemart. As i think you know, Virtuemart has huge problems of duplicate contents (product that stay in 1+ categories), so i've installed sh404sef to remove categories from URLs like: site.it/product

After this, now the problem is:

• I take this offer: couponviaggio.it/village-il-girasole-corigliano-calabro-detail.html
• I search it in google, by the title for example: "Offerta Coupon
  vacanza mare Il Girasole Village,Corigliano Calabro sullo Jonio" The first link is correct, when i open this, it goes to another page:
  [couponviaggio.it/hotel-mistral-oristano-detail.html][3]...It do a
  redirect to an insensate page!

But, if i copy the link in the url bar, it goes to the correct page..strange.. This thing happens for several offers, it's for 4 week that the problem persist, and i'm going crazy. Can you help me? :) Thank you guys, regards from italy

Answer 1

When I answered you previous Q 'Virtuemart duplicate URL for products assigned to 1+ categories'
I didn't realize that your main concern and the reason for asking how could you eliminate any category from product URL, was "Duplicate VM Content issue" from the SEO point of view.

I think that is NOT AN ISSUE AT ALL!

Even Google in it's official documentation Duplicate Content at the very begining clearly says:

Examples of non-malicious duplicate content could include:

• Discussion forums that can generate both regular and stripped-down
  pages targeted at mobile devices
• Store items shown or linked via multiple distinct URLs
• Printer-only versions of web pages

Even on VM Forum there are topics regarding that 'issue', like Duplicate content because of Virtuemart Product Category SEF alias? and others.

Clearly, having product in multiple categories and hence reachable by multiple URLs would not constitute malicious duplicate content as Google defines it in aforementioned article.

Otherwise, milions of web stores would never have multiple categorizations, which they regularly use every day.