[Vuejs]-Vuejs input form Unexpected token

remove {{}}.

<form action="https://api.random.org/verify" method="post" target="_blank">
  <input type='hidden' name='format' value='json'/>
  <input type='hidden' name='random' v-model="game.random"/>
  <input type='hidden' name='signature' v-model="game.signature"/>
  <input class="check-on-random-org-btn" type="submit" :value="`Ticket: ${ game.number }`">
</form>