damus has never had issues with any zaps except invalid ones. we strictly validate zaps to prevent people from faking them. the only thing this says is that other clients are not validating them properly, or perhaps the alby hub zapper is not sending the zaps to the right relays.
Discussion
its possible alby hub has introduced some strange edge case that is causing it to be incorrectly marked as an invalid zap, but I have yet had time to investigate
Hopefully this is an easy bug to diagnose and fix because otherwise Alby Hub is the most seamless and fastest self-custodial solution for zapping, and I would love to see more people using it on Nostr.