“Couldn’t post comment” every time I try to post a comment with a specific format

I’ve observed that since yesterday every time I try to post a comment with the format “[number] and [number] <3” the comment doesn’t even get posted and I immediately get the “couldn’t post comment” message. (for example saying “1 and 2 <3” What’s strange is this ONLY happens when I use this format, like for example I can comment “[number] and [number]” or [random words that aren’t numbers] <3” or “[number] <3” and they post and show up. Is anyone else experiencing this?? Does anyone know why this is happening?