Caused by RA-17. Found in ACE-5254 root cause analysis.
Each of these pages has a reference to the .theme-company-logo CSS class which used to show an Alfresco logo until RA-17 r106332.
I suggest fixing these two pages by putting the same code as is used in login.get.html.ftl, specifically
Also, as I mentioned in ACE-5254
We probably should add background-repeat: no-repeat; back to the presentation.css .theme-company-logo CSS class to prevent future repeating logo bugs.