This is completely normal in chrome (as of recently). There was a discussion here where they discuss the change, essentially on pending requests it was showing certain headers incorrectly, so now they show a warning that these are provisional headers.
From the discussion:
Network Panel: add caution about provisional request headers. (was: In developer tools, request headers for pending requests are incorrect)
I don't know when the fix actually got released, or if you leave Chrome open all the time and so it didn't update for a while - but almost certainly it is nothing you did - just how Chrome works now.
