Phone screen will not turn off after recieving notification? Lineage OS 15.1

[Android Central Question]

I'm using lineage OS 15.1 on the One Plus 5T. Whenever my screen wakes up to show me a new notification, the screen never goes back to turning off. It stays awake, even for hours after the notification! I really can't find a solution, and this is draining my battery, please help!