At the end of August 2021, Google announced that has changed how they generate the page titles for search result listings. In some cases, the 
SERP title link
 and the URL title tag
 are different as Google no longer takes the text from the pages' title meta tag.To help our users to keep up with this change and see which titles Google actually uses, we released a feature that automatically detects both the SERP title link and the URL title tag. You can compare the titles shown in SERPs with the ones added in your meta tags to see whether the title information is different and what is the difference.
The title tag differences are detected not just for Google but also for other major search engines available for tracking in AWR, such as Yahoo, Bing, YouTube, or Amazon.
You can check the title tag differences using the:
Top Sites report
In the Top Sites report the title information is displayed by default.

In the Top Sites > Comparison report you can see how the URL title tag information has changed between the 2 updates selected for comparison.

Keyword Ranking report 
In the Keyword Ranking report, the title link information is available as an additional column while using the 
Keywords & URLs
 display mode.
SERP snapshot view 
The SERP title link and URL title tag can be also compared directly on the SERP snapshots retrieved from the selected search engines. 
