I had the same problem.please do the following it may help you:
By Default List View Threshold set at only 5,000 items this is because of Sharepoint server performance.
To Change the LVT:
- Click SharePoint Central Administration,
- Go to Application Management
- Manage Web Applications
- Select your application
- Click General Settings at the ribbon
- Select Resource Throttling
- List View Threshold limit --> change the value to your need.
- Also change the List View Threshold for Auditors and Administrators.if you are a administrator.
Click OK to save it.