am I being paranoid?

There's this neighbor who is an old dude who has recently started giving us food, probably about four times now. His excuse would be that he cooked too much. Just now, I went out to feed some stray cats with my leftovers from my lunch box. The old man's apartment door was opened, so he saw me go out, and then he called me over and said to get his green bowl that he used to give us food. He said he'd give us food, and I said, “Oh no, but we've already eaten," so he said, "Ah, okay." After giving the cats food, I went back in and took the green bowl to return it to the old man's because I forgot to return it and was just reminded about it after talking to him, but then he said there's no need to return it. Then he randomly gave me money, saying it's money to commute to school. I refused, but he kept on insisting I keep the money. I couldn't do shit anymore, so I kind of just accepted it, and he went back inside his apartment, but my mom heard all that, so she took the money from me and gave it back to the old guy.

I'm kind of creeped out by this because, absolutely, why? I also think the guy is just being genuine, because what if, idk, he just misses his kids or grandchild and is just taking it all out on us, and him being a creep is all in my head? I think all those true crime videos and podcasts I listened to are getting to me and probably giving me paranoia or some shit.
 
BTW, he lives alone, but when I get home from school, sometimes I see a guy in a school uniform (I don't know which school his from because there aren't any logos on his uniform) come out of the apartment. But the old man wouldn't be home.