It is assumed that when a notification comes to you and you review it, it should not appear again. An hour ago I received a notification and I opened the observation, but a few minutes ago the same notification came again, I opened the observation and there was nothing new. This happened to me several times today. The thing is that the date on which the repeated notification arrived does not coincide with the identification in the observation.
The notification time is 15 minutes ago.
However, the identification to which the observation refers was made an hour ago.