When using a browser back button from the Branch commit screen the branch tree disappears

Steps to reproduce:

• create a repo with some content
• create a branch for that repo
• create some commits
• make changes to the branch and push it back to the repo
• open the Repo in Bitbucket
• go to Commits
• select the dropdown to select a branch -> select your created branch -> see the branch tree on the left from Commits
• click the BACK button in the browser -> see that the Tree is gone from it's place and moved down below