I was searching for a password in my Primary Vault and stumbled across some missing entries (that weren't missing as it should turn out later). Depending on which tab view I'm in (favorites or categories) I'm seeing different results. And no, it's not the difference between some items being starred. The categories search result was as expected, favorites was missing a couple of entries.
I'll see if I can clean up my screenshots, but after clearing the search box and trying again, the results were the same again.
1Password Version: 6.2.2 (622005)
Extension Version: Not Provided
OS Version: iOS 9.3 beta 2
Sync Type: Dropbox