ReportViewer10 - 在报表和工具栏周围显示额外的行

I have created a web app that uses reportviewer 10.0.0.0 in VS2010 to render SSRS 2008 reports. The reports and toolbar do render, but they are displayed with weird layout. I see many unnecessary lines wrapped around the report as well as the toolbar (as shown in screenshot). I ran out of ideas on how to fix this problem. Are there some settings I missed for the reportviewer that caused this? How can I fix this issue? Thank you.I have created a web app that uses reportviewer