The Time-Picker is now always being displayed since updating to the latest 4.9.3 release of Meta-Box. A second time-picker will pop up when the time entry field is clicked on as expected, but there is now a second time-picker widget that is permanently displayed on the page.
To recreate this issue simply place a cloneable group time element like so:
array(
'name' => __('Event Time','tevents'),
'desc' => __('Time before countdown launch to trigger this event.','tminus'),
'id' => $prefix . 'event_time',
'class' => 'tminus_time_toggle',
'type' => 'time',
'js_options' => array(
'timeFormat' => 'HH:mm:ss',
'showSecond' => true,
),
)