I created a new sub site in SharePoint 2016. Now I am trying to create hyperlinks to pages in the site on the main page similar to a table of contents. Not all, but some of the hyperlinks when created do not work. After created they show up blue on the page but are not clickable. Then when I re edit the page the URL is gone and has disappeared in the hyperlink area. Any thoughts as to why this may be happening only for certain pages? I have tried inserting the link both from SharePoint and copying and pasting it as an address.