Just a couple of questions to clarify:
What is the source of the report going into Excel.....? (Or did you intend to type "exporting a report" from Excel?)
"Save the report which you do not need" meaning you had already done that or have not had to do it before?
Do you just highlight the desired block of cells, do a CTRL-C, go to the open email and then a CRTL-V?
Anyway, give it a couple of more "start from the beginning" attempts. Look for anything unusual in the source document or in the Excel cells. Extra characters, some garbled words/numbers.
All too easy to brush a key and alter things along the way. Or pick up an extra row or column of cells that brings along some stray characters and codes.
Or have a document become corrupted and cause problems.