Hum..
Accodiing to NIP-57 (the implementation of zaps), notes/events include payment related tags, of which include the amount, lnurl and also relays. My understanding is if a payment is received on that address (unique to the post), it is known by the relays included.

I can't see any zaps on these posts from you, but I did receive it - Did you zap a specific post or my profile? If it was a post, can you link it? 

 It was this post: nevent1qvzqqqqqqypzpte8562wrm20dljp9yqnnfypnvvzmsumalvas40hrq5923km5ly0qy88wumn8ghj7mn0wvhxcmmv9uq32amnwvaz7tmwdaehgu3wdau8gu3wv3jhvtcqypuyg9wz485xtsxc9fw88zpmtl9cg4gnrn7allryac7whpn4vft8sjkvgwr 

 I did some troubleshooting yesterday on an issue that may have been related, essentially some inconsistency with how my LN address worked. It may have had an effect on this particular issue, so if that's the case, shouldn't happen anymore. Otherwise, really don't know.. 🤔