I did a test where I set up a repeater with a post object field and a multi select as sub fields, added code to create a new row and it worked as expected. My code was extremely simple, it just inserted a new row on the current post when you visit the page on the front end.
$post_ID = $post->ID;
$row = array(
'field_56c3a78ded331' => 196,
'field_56c3a7c0ed332' => array(1,3,5)
);
$row_id = add_row('field_56c3a77aed330', $row, $post_ID);
This leads me to believe that there is something that’s interfering with ACF. Especially since you say these are the values you say are being inserted.
locations_repeater - 1
_0_field_565eadf99195b - 563
__0_field_565eadf99195b - '' (empty)
_0_field_565eae049195c - a:1:{i:0;s:9:"sport";}
__0_field_565eae049195c - '' (empty)
What should be in the DB after the insert is this:
locations_repeater - 1
_locations_repeater - field_565eadcd9195a
locations_repeater_0_location_select - 563
_locations_repeater_0_location_select - field_565eadf99195b
locations_repeater_0_available_sports - a:1:{i:0;s:9:"sport";}
_locations_repeater_0_available_sports - field_565eae049195c
So we need to figure out what’s causing this to happen. You’ll need to start by disabling plugins and switching to a default theme. If you can figure out where the interference is coming from then we might be able to figure out how to fix it.
