(calderaforms) Export excel fixing

Hi,
I use calderaforms,when i try to export entries to excel file, results in excel file come like this:

ط«طµط¨asdas”,……..ظ„ط§,,”…… ط³ظٹطھظ… ط§ظ„طھط­ظˆظٹظ„ ظ„ط§ط­ظ‚ط§”,,,,”ewrwer

However, i use another form plugin which it is ok, no problem with it.

How to fix it.

Regards