Google Product Forums
Re: sharing issues
Apr 25, 2012 9:53 AM
Posted in group:
Sheets : Report an issue : Mobile device (specify device type/OS) :
Try clicking on "Share" in the top-right hand corner of the spreadsheet again, and see if that person is listed as view-only.
Also, check that you have not made your spreadsheet published or public. Sounds like this may be your issue.