I suspect this has been asked before because I'm sure I'm not the only one who is driven crazy by it!
I recently got myself a Galaxy Tab S6 Lite and love, except when it comes to notifications!
Today is a prime example, I switched my phone on this morning (Galaxy Note 9) and headed off to work as normal.
I've used it all day for emails, social media etc and when I got home I realised I'd not switched on my tablet so I switched it on.....only to find every single notification I'd received during the day came through...even though I'd already read them on my phone hours before!
This happens every day and works both ways (if I read them on my tablet and then switch my phone on they will all come through on my phone too).
Please, can someone tell me if there's a way to stop this, its driving me crazy!