Try the following scenario:

• In MS Word, create a table with text in every cell
• In the RadRichTextBox, create a new document
• Activate Review/Track Changes
• Add some empty paragraphs or some text: change tracking markup will be displayed
• Just after the inserted text, copy and paste the table from MS Word: none of the cells has change tracking markup
• If you type inside the table, the new text has markup, but the text that was pasted with the table has no markup.
• If you use the right arrow on the keyboard to exit the change tracking tag, then if you paste the table, it seems to work correctly.