Extra words added to sheet names on Numbers files when I open them at work, why?

Question

Everytime I email a Numbers Spreadsheet as an Excel file to myself, when I open it on my work computer, EVERY ONE of the sheets at the bottom adds "Table 1" to it.  For example, the sheet may say, "May 2011".  When I email it to myself and open it, it then says, "May 2011 Table 1" .  If I email it again from my iPad2 then it would say "May 2011 Table 1 Table 1".  Obviously I have to keep going back and renaming each sheet b/c it gets so insanely long after a few emails. 
Any help on either of these questions would be greatly apprecatied!  Thanks!
Kevin

Answer 1

When exporting to Excel, the Excel worksheets are named with the Numbers sheet and table names.  So, if you have a Numbers document with a sheet called May 2011 and that sheet has a single table called Table 1, the resulting Excel worksheet becomes May 2011 - Table 1.
When importing an Excel Spreadsheet into Numbers, Numbers creates a sheet from the Excel worksheet and creates a table (Table 1) for the data. So an Excel worksheet called May 2011 - Table 1 will result in a Numbers sheet called May 2011 - Table 1 and in that sheet will be a Table 1.
That's what you are seeing and there is no workaround.  Numbers and Excel are not structured the same. Import and export are not one-to-one processes.  Importing and exporting back and forth is not recommended for any proprietary format, be it spreadsheets, word processing documents, CAD files, or whatever.  It is better to use an application that natively supports the chosen format. In other words, use Numbers exclusively or use Excel and/or its clones exclusively.