You have edited/created a new eStore admin part and placed it on a page. When you make a change to the admin part (ex. changed the store name) the change appears to save successfully. After editing the part or viewing the page again, you may see the store revert to the default settings.
The eStore can revert to default settings if there are any eStore parts on the page or template associated with a different store/store number. To resolve the issue, cut any eStore parts from the page or template (or create a new template with the parts removed) that are not associated with the store you are updating.