Your profile details incl lnurl/lnaddress is just another note that can be updated and thats published on your relays. So it depends which version of your profile the zapper has from his/her relays. Also there are seperate lnurl and lnadress fields that are sometimes mixed up/used differently by clients.
Discussion
Ah gotcha, that makes sense, so different users can have different addresses of mine that they connect too 🔥
It feels like the LNURL static address feature is highly underused in lighting wallets.
Yes its not great yet, you cant really use it with a non-custodial wallet, although nostr:nprofile1qqsrf5h4ya83jk8u6t9jgc76h6kalz3plp9vusjpm2ygqgalqhxgp9gprdmhxue69uhkummnw3ez6ur4vgh8xetdd9ek7mpwv3jhvqgcwaehxw309aex2mrp0yh8xmn0wf6zuum0vd5kzmqpr3mhxue69uhkummnw3ezucnfw33k76twv4ezuum0vd5kzmqs0fpvg is working on a solution.