User can't edit dropdown

I have an application that I shared with 2 users and they can't edit dropdown. They can change but data are not saved.

I shared with support

https://creator.zoho.com/nsisolution/dweho

My problem is on Prospect View, when my users want to edit the field Etat. They can edit all the other fields but not Etat and others dropdown.

Thanks for your support !

Pascal