Removal commit with rebase but still in activity board

Hello,

I’m using GitLab CE 7.10.4.

I pushed a wrong commit with some privates datas, so I made a rebase on my local repo to delete this bad commit and push --force to origin.

Now, the bad commit no longer appears in the git history and I can’t access to this with checkout, cherry-pick, or with a new cloned project. Therefore I suppose the commit is well removed.

However I can always see it in the project’s activity board. It’s a bit annoying.

Is there a solution to clean the activity board ? Or I’ve done something wrong ?

Thank’s for your answers.