I accidently reported someone in half a second on mobile while thieving before I realized there's a toggle option. I don't even know who it was that I reported because i was spam clicking the ardougne knight with a bunch of people. I dont want to get in trouble for false reporting.
Like others have said, you’ll be fine. If it makes you feel any better, my (former) clanmates thought it’d be funny to mass report me several years ago.
Nothing ever happened (since I wasn’t rule breaking), so I think their system is pretty robust and accurate.