Behaviour of Rich text lite field

I have a rich text lite field on a form. I have allowed pictures, attachments and text to be used in this filed.A document is created and a table inserted and attachments attached in the table in the rich text lite field. When the document is subsequently edited without the table or attachments edited the left margin of the table increases by .770cm. Each time the document is edited the left margin further increases by this ammount.

Has any body else experinced this behaviour

Subject: Behaviour of Rich text lite field

I have had issues with table sizes changing when I allow users to insert pictures into Rich Text fields. I have converted all Rich Text fields to Rich Text Lite, and limited it to file attachments.