The old crest is showing because the website favicon/logo needs updating in File Maintenance - Company Maintenance. Make sure you have admin access before changing these settings.
Step 1: Go to File Maintenance - Company Maintenance.
Step 2: Update the favicon logo.
Step 3: Save the changes.
If the old crest still appears after that, the browser may need a refresh or cache clear, it may also require one of the nightly processes to run.