Previous And Next links not showing up

I have an issue of the previous and next links for the posts not showing up on one particular theme. They work on the default and other ones I try just not the one I would like to use naturally. The site is https://www.chrismobleyphotography.com Any advise would be much appreciated and I have looked through tons of similar issues here but hav enot been able to solve it with those fixes, they seemed to of been the problem no matter which template. Thanks.