When a Twitch subscriber arrives, two add-ons work together.

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Hello, I installed an extension from Streamlabs. One is for followers and the other is for subscribers. I added them both as browser sources, but when there is a subscription or a follow, notifications from both sources appear together.

The subscription notification should appear in the top left, and the follow notification should appear in the middle and then disappear when it's done. Can you help me figure out why it's working this way?