Google Has Changed Cumulative Layout Shift Metric
 

The CLS metrics have been updated to reflect a more accurate representation of layout shifts on the page. You might see changes in your page CLS statuses (mostly positive) reflecting this change.

Google said it decided to move forward with the smaller, capped, maximum windows.This may impact your CLS scores in the core web vitals, Google explained: Since this update caps the CLS of a page, no page will have a worse score as a result of this change.