Favicon only works with a few pages?
I couldn't find this issue posted on any forum. So hopefully this throws someone a bone. If it's redundant... sorry.
My issue was my favicon code in header.php was only displaying in a few pages. The code being <link rel="shortcut icon" href="favicon.ico" >
with the favicon image in my root directory.
The resolution was to make sure my page order was sequential.
with the occurring favicon issue my page order was 0,2,4,5,6,8 and my favicon only worked on pages 0,4 and 6. After I changed the page order to 0,1,2,3,4,5,6,7 for each respective page the favicon displayed properly on every page. I can't tell you why I can only tell you thats how I fixed it.
Hope this helps.