Reopening DITA File With Table Results in Table Indent

When I create a table and size columns to get the appearance I want, then close and reopen the file, the table is intended by half an inch. Can anyone explain why? I know how templates and structure rules are reapplied each time a DITA file is opened and understand the overall "on-the-fly" transfomration process that takes place when opening XML files in Frame.

Before answering, I have looked at the following:

• Table format in template does not have an indent.
• EDD does not include any thing (that I could find anyway) that would cause the indent to occur; I checked styles applied to all table elements, as well as title when in a table context.
  
• Table is in <section> element, which is wtihn a <refbod>
• I am on FrameMaker 10, using DITA 1.1 Application, with some modifications to the EDD and styles, but no XML specialization

Any help is greatly appreciated