Error in file summary_api.php -> function summary_print_by_project:
if ( $t_closed_val <= $v_status ) {
$p_cache[ $v_project_id ][ 'closed' ] = $v_count;
} else if ( $t_resolved_val <= $v_status ) {
$p_cache[ $v_project_id ][ 'resolved' ] = $v_count;
} else {
$p_cache[ $v_project_id ][ 'open' ] = $v_count;
}
}
}
(it takes the value of the last record)

Suggested fix:

if ( $t_closed_val <= $v_status ) {
$p_cache[ $v_project_id ][ 'closed' ] += $v_count;
} else if ( $t_resolved_val <= $v_status ) {
$p_cache[ $v_project_id ][ 'resolved' ] += $v_count;
} else {
$p_cache[ $v_project_id ][ 'open' ] += $v_count;
}
}
}