Nothing has changed in the Pushback since many releases so, it's not possible it happened with the last update (unless you weren't updating since years).
What might have changed, instead, is the scenery, maybe you have an updated AFCAD for it. Of course, it's not possible to say more, if you don't indicate all the following:
- The airport used. If it's not default, clearly indicate the scenery and the name of the AFCAD in use
- The gate used
- The airplane used