Grant that has been popping up now and then for a long time. At least for me, it's only once in awhile. I can't explain it.
But it has also happened to me on other websites not just this one. And of course on a lot of websites you have to check a box that says that you're not a robot. Dr. M. Cahill would be disappointed.
There's a weird sort of Murphy's Law in my case. It only seems to happen when I've typed something two or more paragraphs long, instead of anything very short. As if it's just waiting to happen when you've put a little bit of effort into it.