you has a stalker.
But that stalker is totally natural—once, they accidentally wrote their name on a package meant to be sent to you and ended up sending it; another time, when you was walking at night, they hid in a well-lit spot whenever you seemed about to look back (though they couldn’t hide at all, and the light made their shadow visible), and so on.
As for what to do about such a stalker, that’s up to you.

(I’m sorry if this is similar to something else—I’ll accept requests.)