I've been receiving notifications that aren't mine

Excuse my English

Feel free to remove this post if it doesn't suit here, I don't know where else to ask :[

Since earlier today I've been receiving notifications "[name] reacted to your message". There have been at least five of them. I rarely send tiktoks to anyone and I don't text anyone with that name or profile picture, they aren't following me or I them. There's no person like this in my chats and after opening the app there's no trace of the notification. I'm logged into two accounts and it applies to both. After opening the notification the app opens but there's just black screen.

I've tried finding them by the username but with no luck. Could it be from an account that was logged in on my phone? Or just some random person's notifications? Or just a glitch?

This situation is so weird I have never heard of something like that. I'm also worried that if it's from an account that was once logged in and it could be my partners' notifs and it's weird that I wouldn't know that person since we only text each other and our closest friends.