At one time I knew how to clear the ACF cache and force the values to be reloaded, but ACF has changed the way it does this and looking at the code I’m don’t really understand it, and they have no documentation on it.
I would more than likely find a way to store the values in an array during the update and then use those values.
I don’t know if this will help you, but
while (have_rows('repeater')) {
$row = the_row();
}
it is a little known fact that the_row() returns the current row, unformatted, as an array of field_key => value pairs.
