@sayyam_6772 your experience sounds unusual.
CLS measures when content has shifted in your web page. Reference: https://web.dev/cls/ Such movement can usually be caused by scripts inserting/removing/updating content progressively. Do you notice that your web page's content is shifting several times?
LCP measures when the largest image, media or text block has been rendered in your web page. Reference: https://web.dev/lcp/ Do you notice that some images or other elements are being inserted into your web page progressively?
Also, in your extension configuration, did you enable all web vitals to be measured every time? If so, try disabling them by changing the toggles to their grey state, as shown in this screenshot:
Please feel free to contact me if you're still facing issues with my extension.