@ Mention changing after save in pull request description area

When I @ reply/mention someone for instance @nickdenardis,

• typing in the first four characters "n-i-c-k"
• the preview shows correctly
• hit enter and the person on my team is there

After hitting the save/comment button, it changes to whomever owns @nick, even after displaing the person @nickdenardis that is on my team.