Why did my pinned comment unpin?

About a year ago, an A-list celebrity commented on my TikTok, so I replied to it with a video in order to “pin” it. Recently, the comment no longer shows up on the top and you have to scroll down for quite a while to see it, even though it has the most likes by FAR.

Does anyone know if this is just a glitch or if there’s a way to fix it? I know it’s not super important but I’m just bummed!! When you press the comment from my video reply, it still takes you to it, but it’s not at the top when you just watch the video itself.