The same for me. A few thousand zPiv are missing even after installing 3.0.2 and did reset and rescan. I downloaded the blockchain from scratch and it did not make any improvement.
But now I found this tweet.
https://twitter.com/jakimanboy/status/921253349940326400"Until the newer $PIVX wallet is released, please avoid making any PIV or zPIV transfers. Both 3.0.0 & 3.0.2 are now old. Hang tight. #pivx"
So all we can do now is to wait again

As above, it's worth repeating.. Unlock your wallet and run "
reconsiderzerocoins" - it reprocesses the archived zero coin transactions that you can get a list of by going "getarchivedzerocoin". But just the reconsider step by itself should sort it out. Also don't try to spend any zPiv until v3.0.3.