[Plugin: wp-pagenavi] wp-pagenavi stopped working

Hi there,
My navigation has stopped working on my wp-pagenavi for some reason? I have over 300 pages of posts and now when a nav link is clicked it’s taking me to the second pages, but still showing my posts from page 1. I’m at a bit of a loss as to why this has happened, and any help or advice i’d be very grateful for!