object_form.js declared top-level const bindings, which pjax replays verbatim on every visit — the second visit threw "already declared" and silently broke "Ajouter un champ"/"Créer l'objet". Wrapped it in an IIFE. Also renamed the generic name="name" rename-game field to name="game_name" with autocomplete off, since browsers were autofilling it with unrelated previously-typed values.
william