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Hi, Ive only just joined SEO moz and after they crawled my site they came up with 3600  crawl errors mostly being duplicate content and duplicate urls. After researching  this it soon became clear it was due to on page pagination and after speaking with Abe from SEO mozhe advised me to take action by getting our developers to implement rel=”next” & rel=”prev” to review. soon after our developers implemented this code ( I have no understanding of this what so ever) 90% of my keywords I had been ranking for in the top 10 have dropped out the top 50! Can anyone explain this or help me with this? Thanks Andy