Couchbase Mobile Lite iOS not synching all documents sometimes


While I am using Couchbase mobile lite iOS Swift V2.1.2 SDK, sometimes I am getting all the documents and sometimes not. here I attached log images.

Please assist me, what is the wrong here.
Verbose Log 1

Vebose Log 2, here all data synched But records not found in local DB

Couchbase Admin portal Meta data

AddListener with Dispatch Queues not working when app goes background in Couchbase Mobile Lite (iOS Swift)