Cron redirecting to OG page

[Hershel]

On a site with

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'version'  => '4.5.3',
'cms'      => 'Drupal6',
when I visit the cron URL with wrong key I get:

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ERROR: Invalid key value sent. More info at:http://wiki.civicrm.org/confluence/display/CRMDOC/Managing+Scheduled+Jobs
If I fix the key so the URL is correct then it forwards me to

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/nl/group
which is the OG home page in Dutch, on this multilingual site.

Any ideas why the cron might be forwarding and not working?