Update!
I have figured out the problem! It was due to the positioning of the include of my sidebar that was causing it, as this was actually before the related post tag due to my complicated theme layout! Doh!
All sorted now! 🙂
Just to update, this happens in my regular posts also. I didn’t notice at first as I only had a couple of test posts.
Something must have broken at some point as I am creating a heavily modified theme at the moment, just no idea when this happened, as I have spent the past week working just on the homepage.
Any ideas?
Thanks again! 🙂