Indesign form to pdf - Impossible to write lettres with accents in the fields??

Hello,

When I create a form in Indesign and then convert it to a pdf, I get a serious problem with the text fields on the pdf.

We cannot write lettres with accents, like these : é, à, etc. Instead of the letter, we always get signs like you can see on the attached picture.

I tried to change the style of the fields in InDesign to try to control the font with no results.

Would someone know what to do ? We really need those accents. Can  Istill use  InDesign to make our forms, I don't know...

I have InDesign CS6 and Adobe Acrobat X version 10.1.3

Thank you!