Not authorized to reorder structure entries

Description

Somehow I can't reorder structure entries on our staging server. In the red bar a message appears with an unknow error occured. Seems like a bug. I am logged in as a administrator/super user.

Stack trace

2018-04-18 17:24:16 [217.100.226.36][1][1rprs6qtr941te0urqodf1tqgc][error][yii\web\HttpException:403] yii\web\ForbiddenHttpException: User is not authorized to perform this action in /var/www/vhosts/site.com/httpdocs/vendor/craftcms/cms/src/web/Controller.php:187
Stack trace:
#0 /var/www/vhosts/site.com/httpdocs/vendor/craftcms/cms/src/controllers/StructuresController.php(67): craft\web\Controller->requireAuthorization('editStructure:3')
#1 /var/www/vhosts/site.com/httpdocs/vendor/yiisoft/yii2/base/BaseObject.php(109): craft\controllers\StructuresController->init()
#2 /var/www/vhosts/site.com/httpdocs/vendor/yiisoft/yii2/base/Controller.php(86): yii\base\BaseObject->__construct(Array)
#3 [internal function]: yii\base\Controller->__construct('structures', Object(craft\web\Application), Array)
#4 /var/www/vhosts/site.com/httpdocs/vendor/yiisoft/yii2/di/Container.php(375): ReflectionClass->newInstanceArgs(Array)
#5 /var/www/vhosts/site.com/httpdocs/vendor/yiisoft/yii2/di/Container.php(156): yii\di\Container->build('craft\\controlle...', Array, Array)
#6 /var/www/vhosts/site.com/httpdocs/vendor/yiisoft/yii2/BaseYii.php(345): yii\di\Container->get('craft\\controlle...', Array)
#7 /var/www/vhosts/site.com/httpdocs/vendor/yiisoft/yii2/base/Module.php(642): yii\BaseYii::createObject('craft\\controlle...', Array)
#8 /var/www/vhosts/site.com/httpdocs/vendor/yiisoft/yii2/base/Module.php(596): yii\base\Module->createControllerByID('structures')
#9 /var/www/vhosts/site.com/httpdocs/vendor/yiisoft/yii2/base/Module.php(522): yii\base\Module->createController('move-element')
#10 /var/www/vhosts/site.com/httpdocs/vendor/craftcms/cms/src/web/Application.php(267): yii\base\Module->runAction('structures/move...', Array)
#11 /var/www/vhosts/site.com/httpdocs/vendor/craftcms/cms/src/web/Application.php(515): craft\web\Application->runAction('structures/move...', Array)
#12 /var/www/vhosts/site.com/httpdocs/vendor/craftcms/cms/src/web/Application.php(251): craft\web\Application->_processActionRequest(Object(craft\web\Request))
#13 /var/www/vhosts/site.com/httpdocs/vendor/yiisoft/yii2/base/Application.php(386): craft\web\Application->handleRequest(Object(craft\web\Request))
#14 /var/www/vhosts/site.com/httpdocs/web/index.php(21): yii\base\Application->run()
#15 {main}

Additional info

• Craft version: 3.0.3.1
• PHP version: 7.1.16
• Database driver & version: MySQL 5.5.5
• Plugins & versions:

Start with the reported move-element request in StructuresController.php and the authorization check in Controller.php, using the provided 403 stack trace and Craft 3.0.3.1 details. Reproduce reordering as an administrator on the staging setup and trace why editStructure:3 is rejected. Done means an authorized administrator can reorder structure entries without the 403 error.