JIRA/Confluence some times need to scale the original size of the global logo. The resultant size may differ by using oversized or undersized images. To reproduce, just upload a custom logo to both JIRA and Confluence via global logo admin section respectively.
See the inconsistencies between JIRA and Confluence using the attached logo.
It could be well related to the constraint set by both apps. These info messages are displayed on the global logo upload page:
- JIRA: "The height of the logo image will be constrained to a maximum of 30 px. Also, it is recommended to use an image with a 57 px width."
- Confluence: "The height of the logo image will be constrained to a maximum of 48 px."
This is verified on Chrome, Safari, Firefox.
Ensure consistency of the global logo size across all apps. This is important for branding.