When inserting tables into content using Alloy Editor the published content will have properly styled table borders. When editing the content, the same table borders are treated by the default browser styling taking us way back to the 1990's. When implementing CKEditor as a replacement to AE there should be a consideration given to styling the tables.
Table borders to be styled in editing mode
Table borders are not styled so you don't get what you see
Note 7.2 found to have this bug fixed, 7.0 is not fixed, so this really isn't a feature request.