There are two versions of this meme drawn in almost the same artstyle. Here’s the one this meme is based on, which says “quit having fun”:

This is in fact a redraw of an XKCD cartoon which is one panel and thus harder to make memes out of which says “stop having fun”:

It’s not just you.

Mandela effect. It’s always been Quit. Stop just sounds more natural

reddit bros would literally rather believe they slipped through the cracks in reality than that they misremembered one word for its synonym