It’s a problem with the translation, notice the second item in the array includes a single quote which hasn’t been html encoded.
Edit the wordpress/wp-content/plugins/wp-statistics/includes/log/exclusions.php file, line 17 will be:
$excluded_reason_translate = array( 'Robot' => __('Robot', 'wp_statistics'), 'Browscap' => __('Browscap', 'wp_statistics'), 'IP Match' => __('IP Match', 'wp_statistics'), 'Self Referral' => __('Self Referral', 'wp_statistics'), 'Login Page' => __('Login Page', 'wp_statistics'), 'Admin Page' => __('Admin Page', 'wp_statistics'), 'User Role' => __('User Role', 'wp_statistics'), 'Total' => __('Total', 'wp_statistics'), 'GeoIP' => __('GeoIP', 'wp_statistics'), 'Hostname' => __('Hostname', 'wp_statistics'), 'Robot Threshold' => __('Robot Threshold', 'wp_statistics'), 'Honey Pot' => __('Honey Pot', 'wp_statistics'), 'Feeds' => __('Feeds', 'wp_statistics') );
replace it with:
$excluded_reason_translate = array( 'Robot' => htmlentities(__('Robot', 'wp_statistics'), ENT_QUOTES), 'Browscap' => htmlentities(__('Browscap', 'wp_statistics'), ENT_QUOTES), 'IP Match' => htmlentities(__('IP Match', 'wp_statistics'), ENT_QUOTES), 'Self Referral' => htmlentities(__('Self Referral', 'wp_statistics'), ENT_QUOTES), 'Login Page' => htmlentities(__('Login Page', 'wp_statistics'), ENT_QUOTES), 'Admin Page' => htmlentities(__('Admin Page', 'wp_statistics'), ENT_QUOTES), 'User Role' => htmlentities(__('User Role', 'wp_statistics'), ENT_QUOTES), 'Total' => htmlentities(__('Total', 'wp_statistics'), ENT_QUOTES), 'GeoIP' => htmlentities(__('GeoIP', 'wp_statistics'), ENT_QUOTES), 'Hostname' => htmlentities(__('Hostname', 'wp_statistics'), ENT_QUOTES), 'Robot Threshold' => htmlentities(__('Robot Threshold', 'wp_statistics'), ENT_QUOTES), 'Honey Pot' => htmlentities(__('Honey Pot', 'wp_statistics'), ENT_QUOTES), 'Feeds' => htmlentities(__('Feeds', 'wp_statistics') ) );