Dear Jonyhan,
once activated, the copyright area will be displayed on all pages by default – this is the intended theme’s behaviour so as to show the copyright holder of the website on all parts of the website. The copyright area, just like the footer widget area, will display right under content, thus if the height of the content on a particular page is small, it will float up from the bottom of the page, which is also a normal behaviour – most other WordPress themes use the same CSS principles and thus have the same effect – since it is not possible to fix the footer at the bottom of the page only for pages with small amount of content using purely CSS.
However, if you want to keep the copyright only on the front page, please do the following: go to “Appearance -> Editor” and add the following lines of code at the bottom of the “style.css” file (should be opened by default):
.home #footer #copyright { display: block !important; }
#footer #copyright { display: none; }
and do not forget to hit “Update File” to save the changes!
Let me know if this is what you needed.
Best,
Andrew / Satori Studio