I think some people just want to look at cute photos of cats without thinking about negative things. I can understand that. But if I posted a photo of my cat exhibiting what could be a symptom of a serious problem that I wasn't aware of, I would want someone to tell me. I know OP said this is a repost, but I still think it's important for anyone who loves their cats to be able to tell if something is wrong. This doesn't look like normal cat behavior to me.