How to replicate the issue

1. Using the attached document, TestSample1.docx, copy and paste the content into the RADEditor and choose to remove Word Format.

2. Observe the styling and the format of the pasted content in the editor.

You will notice that the table will not appear properly and the font styling and size and all remove instead of converted.

1.  Using the attached document, TestSample2.docx, copy and paste the content into the RADEditor and choose to remove Word Format.

2. Observe the styling and format of the pasted content in the editor.

In this case, you will notice that the table is intact and font styling and size are converted to HTML format.

The difference between the TestSample1.docx and TestSample2.docx is one has numbering in Heading. The numbering appears to have affected the result of pasted content from MS Words.
The expected behaviour would be the same as the test result from TestSample2.