By default the current month will be shown on the WooCommerce Bookings calendar for performance reasons. This will default it to the month with the first available block.

bookings_calendar_default_to_first_available.php

<?php // do not copy this line

/**
 * Will make the Bookings calender default to the month with the first available booking.
 */
add_filter( 'wc_bookings_calendar_default_to_current_date', '__return_false' );

Thanks guys for the info!