Duplication of page nos within citation

How can I delete these, everytime when I click on linking citations with the bibliography, the nos within intext gets duplicated.

Even when I try to convert to unformatted I get the smae problem. I have copied the work in different Wprd doc but the problem persist.

Please help

Example: (Denton, 2013:183183) instead of ( Denton, 2013:183)

I am using version 9