This is due to the way permissions are configured in your server. Streamcord will automatically delete notifications in channels it doesn't have permissions to send messages in.
Refer to the next section for information on how to properly configure permissions in your announcement channel.
Ensure that Streamcord has correct permissions in order to send notifications.
Give Streamcord the following permissions for your notifications channel:
Read Message History
Use External Emojis
Due to the way how Twitch API works and to the sheer size of total notifications, the bot takes some time to send out notifications. Timing vary based on the the type of notification used:
Legacy Notifications (Streamcord) : 3 - 7 mins
Legacy Notifications (Streamcord Pro) : 1 - 3 mins
Webhooks: 2 - 5 mins
Live Role Notifications: Near-instant