Junck Characters in XML EXCELL Output

While running the xml publihser report for the below format, the report out has been shown as 00444 value, but I copied the value in Notepad and re-import into Excell. The value is shown as

?00444?.

My Field is setup in word (BI Bublisher)

 <fo:bidi-override direction="ltr" unicode-bidi="bidi-override"><?INVOICE_NUM?></fo:bidi-override>

  How can I remove this invalid characters

Thanks