Differences between builder and site

Hello dear Appianistes, 

I have a gap between how my app reacts in development tools (build) and in the site,

Site :

After using AJOUTER button :

Builder :

After using AJOUTER button :

Any guesses ? 

    buttons: a!buttonLayout(
      primaryButtons: {
        a!buttonWidget(
          label: if(ri!isUpdate, "Enregistrer", "Ajouter"),
          saveInto: {
            /*sous-periode*/
            a!forEach(
              items: local!sous_periode,
              expression: { 
                a!save(
                  ri!sous_periode[fv!index]['recordType!{77c00203-ec59-4d91-815a-0f6334649b51}alan_r_sous_periode.fields.{38d14ae2-8fd9-40ee-a277-dbc90afc6266}dateDebut'],
                  local!sous_periode[fv!index]["deb"]
                ),
                a!save(
                  ri!sous_periode[fv!index]['recordType!{77c00203-ec59-4d91-815a-0f6334649b51}alan_r_sous_periode.fields.{368c8cd0-aeff-4d35-b85f-e83787ea7fa8}dateFin'],
                  local!sous_periode[fv!index]["fin"]
                ),

              }
            ),