Command line merge insturctions do not correspond to repo setings

I have set our repos in GitLab 10.8.2 to perform a fast-forward merge, still when someone creates a PR, the provided command line instructions below the merge buttons say:

Step 3. Merge the branch and fix any conflicts that come up

git checkout master git merge --no-ff LDMC2D_CD-567

This does not correspond to the repo settings not doing any merge commits.