Sync Gateway Replication Android

Hey Guys,

i use the couchbase lite replication method to talk to the couchbase sever.
i have a dcocument with id “1” but how come everytime call the push replication,
it not only syncs that document up but also a local document name "_sync:local:06640b8b80876d54aade3b7e104fd9d101daec64"
“_rev”: “0-2”,
“lastSequence”: “17”

can someone explains this to me and also how to avoid this from happening?

i have name my document to document id “1”.