I have not checked this out but your page title is
Raleigh Newborn Photographer | Raleigh Newborn Photographer | Nicola Lane Photography
And I would imagine that was duplicated around your site. Word press uses the page title when you create the page and it has to be unique. If it's not unique it will add a number on the end, hence 28. I would guess you have made at least 28 pages with the exact same page title.
I am not a big user of word press but I am pretty sure they call this the slug, I believe you can change this to whatever you prefer, however, do bear in mind you are changing the URL so creating a different page by altering it. Any links going to the old URL will now produce a 404 error (page not found).
Changing the page title after the event though will not change the slug so you may look at pages with this number but now the page title does not match but did at the time of creating.
I am sure some Wordpress expert will come along and give you a better answer but that's why I think you have the number tagged on the end.