GA4 shows long string of letters & numbers on "page page and screen class" for conversions

I was reviewing the conversions for submitted forms, and when I tried to expand the results to see more details, the conversion and event numbers were getting truncated. I eventually discovered that this issue was caused by a single result that consisted of a long string of random numbers and letters.

I managed to narrow down the date and source of this particular result. However, the email campaign it supposedly originates from does not contain any such link. Do you have any insights into why this is happening or how I can remove it to facilitate a smoother data viewing experience? Thank you.

Seems like it's a case of "referral spam." This is evident in the Page Path report because it uses "%3F" (URL encoding) instead of "?" to indicate the beginning of a query string. To address this issue, please submit a data deletion request (Editor-level access or higher is required):

You can also read this - google support article link (support.google.com/analytics/answer/9940393?hl=en#zippy=%2Cin-this-article)