Missing Vertical tabs path and xmlsitemap in node edit form.

Drupal 7.23
Field group 7.x-1.1
We are developing site which has node type "event". We have done a lot of field group configuration, because the node has lot's of fields and we are grouping them. At some point we noticed that the "Url path settings" and "Meta tags" vertical tabs has dissapeared - the modules which adds those tabs where enabled from the very beginning and the tabs did work - we reverted to older version of the database and they did work.
I disabled the field_group module and found out that the tabs are back.
Then I enabled the field_group module - the tabs are gone.
So the problem is with the field_group module settings somewhere in the database.
I found out that the table field_group for all the records the column "identifier" is prefixed with "group_" prefix except the identifiers: "path|node|event|form" and "xmlsitemap|node|event|form". As soon as I removed this 2 records from the table and "flushed caches" the missing vertical tabs where back!