When branches get deleted on origin, your local repository won't take notice of that.

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You'll still have your locally cached versions of those branches (which is actually good) but git branch -a will still list them as remote branches.

You can clean up that information locally like this:

git remote prune origin

Your local copies of deleted branches are not removed by this.

The same effect is achieved by using (kudos to Julien Show archive.org snapshot ):

git fetch --prune

You could also set that as a default.