Yes it is a browser issue to some extent, as mentioned in the other topic.
Could you post the URL of your forum and confirm whether the additional link is something you've added or a new feature built into Nabble in apps with a sidebar and set to "Wide".
As I said before, it would be best to follow up in the other topic as this a single issue related to embedded sidebar applications displaying in various browsers both on mobile and other devices.
Volunteer Helper - but recommending that users move off the platform!
Once the admin for GregHelp now deleted.