Thank you for your post and screen shots.
Are all objects anchored left and top? Or, is it possible you have one of the objects anchored right so that it adjusts to the window size? That is, drag the right edge of the window smaller and see if any part adjusts with the window size?
If this isn't the issue, then I'd like to see a clone of your database file so I can try it here. Check your Inbox at the top of this page for instructions where to send your file.
I will be sending a clone of my database shortly. This is not a anchoring issue, I checked it. I have been investigating further and came up with the cause. The issue is in OS X itself. If OS X is set to show scroll bars only when scrolling the layout mode does not match browse mode. If OS X is set to show scroll bars always the body part renders in the correct position.
(This setting for OS X is under System Preferences->General)
I received your file. Thank you.
In the dashboardCoversShipped layout, you don't have left anchors on the header items, so they are free to float horizontally. If you size the window larger, you will see the header objects slide to the right. The same applies for the other layouts.
Put left anchors on the boxes and text objects and the header information will no longer shift.