Strange that it shows that way on your end. I indeed received them in my wallet and it shows on my note in Damus. Have you noticed any patterns about which ones disappear on your end? For instance, if you zap someone with a @ln.tips lightning address (like I use) less than 21 sats it won't show up as a zap. Or if you zap a ZeusPay address it won't show up as a zap until they open their wallet and claim the payment on their end.