Mongodb - Cluster one host keeps syncing
Answer generated from question comments by Stennie:

By "database is still syncing", I assume you are referring to the syncingTo message in the rs.status() output. This just informational and shows which member a secondary is syncing from.

All of your replica set members currently have the same optime so there is no replication lag and this is a normal state. For more detail see my answer to a similar question on Stack Overflow: 

MongoDB replica set - always shows “syncingTo”

I would also note that MongoDB 2.6 reached End of Life as of last month (Oct, 2016) which means there will be no further maintenance releases. I would highly recommend upgrading to a supported release, particularly if this is a new deployment. The latest production release series is currently MongoDB 3.2.