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. 
Even about 1min later, Damus still indicates that I did actually zap you. But nostr:npub1lrnvvs6z78s9yjqxxr38uyqkmn34lsaxznnqgd877j4z2qej3j5s09qnw5 if you check, I bet you did not actually receive those sats. 
Discussion
That is interesting…
In general, today I saw that over the last couple days, most of those ⚡️ icons turned back to blank (indicating no zap). I did cross check one or two notes from Primal to see they were NOT in fact zapped by my account.
I’ll do more investigating tomorrow after logging into Alby, I don’t have the energy now. Thanks for helping to debug!!
