I think EU PSN freaked me out: I bought RE0 digital since I got all the other games digital on PS4.
I go to see the RE1 HD and click on 'see more' to see if there were any DLC for RE1 HD, if any.
I see a page that has a bundle of RE0+RE1 HD and it says that I had bought it. It freaked me out as I thought I had bought the bundle but I go as far back as March and I don't see it anywhere in my purchase list.
So I think the webstore, in order to prevent users from rebuying a game in a bundle, will show the complete bundle as if it were purchased.