Btw. Zap means nip57 - nostr integrated lightning payment: https://thebitcoinmanual.com/articles/nostr-zaps/

These can for example be a post-level thing so a compatible client can show how much sats are sent to a certain post :D You can then "like posts" by zapping some sats.

I think the direct lightning payment (without nip57) is considered a tip? That is what your sats seem to go through. -Many people call also these zaps - but imo its a little bit different thing.