Who I have the same questioned this topic

I have a Galaxy S20 Plus. This issue started a couple weeks before I upgraded my phone, I previously had a Galaxy S9. I get a text notification once a text comes in but then when I pick up my phone/open the home screen the text notification comes through again. I have set Message + as my default and I have turned off all repeat reminder notifications and it still won't go away. This is driving me insane, how do I make this stop.