World Writer behaving differently between environments

Each month we copy our Production Data and Common libraries from Production into Acceptance - we've been doing this for years.

This copy was completed yesterday morning.

One of our users has noticed that, in Production, when he submits a World Writer to process, on the right hand side of the screen it now puts today's date beside the version whereas it always used to put the word 'Submitted'

I have found this to be the case when I submit a WW as well - using both green screen and JWalk (although I wouldn't expect these to behave differently from each other)