[Nico]

I was able to figure the cause for this. The form with ID buy-tickets was rendering twice on the same page. One was for Mobile and other one was for Desktop that is what causing this validation issue. The class “.av-single-event-meta-bar-mobile” is hidden and only gets display on Mobile but since the html part is being loaded in the dom it is causing this issue. Not sure how you will deal with but I think that mobile mark up should not get loaded on Desktop.

[Nico]

This was a conflict between enfold theme and event ticket plus. Using this thread (http://www.kriesi.at/support/topic/conflict-with-event-calendar-attendee-information/) I fixed the issue adding some jQuery

$('.quantity').on('click', 'input[type="button"]', function(){
        $('.quantity input[type="text"]').trigger('keyup');
    });

Hope this helps.

[Author]

Posts