I found the actual issue so I thought I'd update.
ACF documentation says to use $today = date ('Ymd') to compare dates but you really need to use current_time('Ymd') so I removed the functions.php code that I added and fixed the problem rather than work around it.
Here's my query now
$event1 = current_time('Ymd');
$args = array(
'post_type' => 'events',
'post_status' => 'publish',
'posts_per_page' => '10',
'meta_query' => array(
array(
'key' => 'event_date_ends',
'compare' => '>=',
'value' => $event1,
)
),
'meta_key' => 'event_date_ends',
'orderby' => 'meta_value',
'order' => 'ASC',
'paged' => ( get_query_var('paged') ? get_query_var('paged') : 1 ),
);