Changed data in PDF created by pdf creator

Hello,

Maybe someone else aks this question before,

I use pdf creator for making pdf's. so I am sure the receiver gets the same data as I send

But it won't happen, the content in the pdf is changed, it is opened by an acrobat reader version

Can it be a problem with font's,  or is there an another solution?

Is there someone else who had the same problem ?

thanks

Peter