Did you install the official Reddit app? Same happened to me when I did. They seem to enable notifications for recommended posts once you log in. I turned that shit off and deleted the app. I don’t want any settings changed by the mere act of logging in somewhere.
It’s a you problem, but not really a unique one. I scroll through Lenny on desktop, open everything that seems interesting in a background tab and half the time I never even switch to them. With Memmy, I either look into a post right away or keep scrolling. I’ve just gotten used to that way of browsing because most sites don’t take you back to where you were before but generate new random content. Reddit is especially bad at this. Apps do a pretty good job at going back to exactly where you were before without reloading the site.