idPrevPage and idRecommendation are internal parameters that are generated automatically on the fly. There are two ways in which this does not affect the SEO of your site:
It would be necessary to disallow the URLs with those parameters at Robots.txt level. It would be something similar to:
You can see how to do it in the following url: https://stackoverflow.com/questions/9149782/ignore-urls-in-robot-txt-with-specific-parameters
If the robots.txt file is not a solution for you, please contact our technical service (email@example.com) and we will solve it.