I'm sorry to even suggest this, but given the report button's new prominence, you may need to make a small UX change. Most folks are used to the dismiss button being in the "header" of the window so you might need to move the "x" to prevent folks from misreporting when they fat finger a click.
Alternatively, you could put a "cancel button" next to the "Submit."
I only suggest this to help you avoid getting more useless reports, and feel free to ignore me.
Having a bit of fun on LinkedIn prompted by someone's poll here.
https://www.linkedin.com/posts/letucker_leetheism-activity-7183872789773213697-Abka
Trans Ally. Cister even.
You are currently in one of the timelines controlled by Loki, please set your expectations accordingly.