Why is WCF service when run on production machine ( Server 2013 ) have different results then when run on test machine ( Windows 8 Ultimate )

Hi,,
I am writing some french characters out to my sql database which I have read from a file stream.  On my test machine ( Windows 9 Ultimate using IIS Express) it writes to the production server ( Sql Server 2012 on Server 2013 ) database correctly,  however when I publish my wcf service to the production machine ( server 2013 using IIS  ) and read the same file and execute the same code it messes up the french characters when writing to the same ( Sql Server 2012 on Server 2013 ) database.  I have powershelled Text:Encoding::Default and compared the results on both machines everything is the same..
the sting I'm trying to write is:  poignée
running the code on windows 8 poignée ends up in the database, 
running the same code on my server 2013 production machine poignées ends up in the database?  why?

some addtional points.
-1- the encoding I'm using whe ...