Work flow condition not working

Good morning,

In the production environment I have the following work flow set up which was working up until last week which automatically updates the close date to "Today" when the sales stage changes from current to "Closed/Won"

Condition is:

(PRE('<SalesStage>') <> [<SalesStage>]) AND ([<SalesStage>] = 'Closed/Won')

there is a wait action of 0 minutes so it happens instantly and then the last action of field update which changes the close date to "today".

I have the exact same work flow set up in the staging environment which works perfectly fine, however this one in production does not and I cannot figure out why.