Older Articles/Newer Articles Buttons

Hello,

Older Articles/Newer Articles buttons do not appear at the bottom of the page 9 (to change to page 10 or 8 of my blog). And yes, I’ve this problem ONLY in the page 9. It is very strange.

And I do not have this problem at the bottom of page 9 of any of my categories; it is just in page 9 of “HOME” (where appear all posts of all categories).

Have you any idea how can I fix this problem? Thanks in advance.