Why am I receiving multiple notifications over time for the same thing?

[purplewasteland6]

I have an LG G6 if that makes any difference.

I will receive a notification for something like facebook, instagram, youtube, etc., and I will clear it from my notification panel, and then some time later, whether it be a few minutes or even a few hours, I receive the same notification again. The notification will say something like "9:34 AM", and then I press the notification to go to instagram, for instance, and the last notification was from the night before.... so why am I receiving the notifications more than once? Its very frustrating.

The issue has been ongoing for the past month or so.