1 to many donations don't work

Hello
i noticed that when i try to donate from ONE ZEC wallet to MANY
for example if i want to donate to 5 projects in 1 transaction instead of 5 transactions 1 by 1
then my contributions are invalid
for example here https://gitcoin.co/grants/1484/fast-sync-for-zecwallet-android-and-ios?tab=transactions
20/11/07 sexdrugsandzcash Failed
however i sent the ZEC to their wallet
as you see many transactions are failed there from various reasons but especially because people want to donate to many projects at once..
same here: https://gitcoin.co/grants/1513/zcash-observatory-netsec-dashboard-api-and-resear
the "Failed" error has disappeared , however the number of contributors is still 4 despite the fact that there are 6..

Thanks a lot
the platform is great 👍 :)