I'm running Alfred 3.7 [938] on macOS 10.14.1 (18B75), and have spotted multiple Alfred hats in my menu bar a few times recently.
Today, it's two Alfred hats. I saw four the other day, but didn't think to take a screen shot.
Activity Monitor shows two Alfreds. I'm not sure how there are two. I'm not in the habit of starting Alfred again. If I try to do so deliberately, the new Alfred invokes the first and then shuts down.