So when doing some SERP checks I noticed that the title of posts and pages are now showing some new but not wanted information in the title (in the red circle). See photo.

This extra bit on the end seems to be confusing the search engines as we have had a recent decline in the SERPS.
I cannot find where to modify this extra bit (in the red circle) in the titles or setting or in Yoast to stop this. This was never there before so it may be a bug or a new feature in a recent update.
Any help would be appreciated.
