Good news !
System & App Infos
My iPhone(IOS13.2.3 iPhone XR)
My Enpass version is 6.3.1(410)
Duplicate data will only appear on iPhone, not on WIN10
I tried to create a new database for synchronization, but found that after creating a new record, two are displayed directly. At this time, this database is only local.
So I recorded a video, I hope it will be helpful to you, and I hope to solve this problem as soon as possible