On the jenkins homepage the footer scrolls up with the rest of the page

I just installed Jenkins LTS 1.625.1 on Linux in Tomcat.
On the Jenkins homepage, the footer scrolls up with the rest of the screen.

Jenkins_initial picture shows what i see on the left bottom side of the screen.
When I scroll, the footer scrolls up with the rest of the page, revealing what I see in Jenkins_scrolled picture.