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