Page header on /user page changed to "Timesheet"

I'm the admin of the site, and this issue only occurs on my account, not users with regular permissions.

On my /user page, with the View menu tab and the "Time sheet" tab , the h1 class="page-header" of the page is changed to "Timesheet" - all one word - instead of my username. This does not occur when I'm viewing the "Track" tab, however; the user account name displays normally.

What could be causing this?