Clash with WooCommerce

Does this happen on products list in admin?

Ok, so find and replace existing add_new_event_columns_content() function in class-listing.php.

/**
	 * Add new event listing columns content
	*/
	public function add_new_event_columns_content($column_name, $id)
	{
		global $pagenow;

		$screen = get_current_screen();

		// event edit screen only
		if($pagenow === 'edit.php' && in_array($screen->post_type, apply_filters('em_event_post_type', array('event'))))
		{
			$mode = !empty($_GET['mode']) ? sanitize_text_field($_GET['mode']) : '';

			switch($column_name)
			{
				case 'start_date':
				case 'end_date':
					$date = get_post_meta($id, '_event_'.$column_name, true);

					echo (em_is_all_day($id) ? date_i18n('Y-m-d', strtotime($date)) : date_i18n('Y-m-d, ' . $this->options['general']['datetime_format']['time'], strtotime($date)));
					break;

				case 'recurrence':
					$recurrence = get_post_meta($id, '_event_recurrence', true);

					echo $this->recurrences[$recurrence['type']];
					break;

				case 'tickets':
					if(!em_is_free($id))
					{
						echo __('paid', 'events-maker').'<br />';

						if($mode === 'excerpt')
						{
							$tickets = get_post_meta($id, '_event_tickets', true);

							foreach($tickets as $ticket)
							{
								echo $ticket['name'].': '.em_get_currency_symbol($ticket['price']).'<br />';
							}
						}
					}
					else
						echo __('free', 'events-maker');
					break;

				case 'featured':
					global $pagenow;

					$url = wp_nonce_url(admin_url('admin-ajax.php?action=events_maker_feature_event&event_id='.$id), 'events-maker-feature-event', 'em_nonce');
					$is_event_featured = (int)get_post_meta($id, '_event_featured', true);

					echo '<a href="'.esc_url($url).'" class="toggle-featured-event" data-post-id="'.$id.'" title="'.__('Toggle featured', 'events-maker') . '">';
					if ($is_event_featured)
						echo '<span class="dashicons dashicons-star-filled" title="' . __('Yes') . '"></span>';
					else
						echo '<span class="dashicons dashicons-star-empty" title="' . __('No') . '"></span>';
					echo '</a>';

					break;
			}
		}
	}

It will be fixed in the new release.