Tasklist and tasks of one group appear in another group

I was testing 1.7 installation for a client and came up to this situation which seems like a bug

I am using an installation of openlucius 1.7 downloaded with drush and installed using web installer
No problems on the installation were encountered and NOTHING was modified after installation
(no modules / no configuration changed / just added and then deleted a status term)

Here is what I have
- First Group, Yihaaa! with default tasklist First Group, Yihaaa!
- Company1 with default tasklist Company1
- First Group, Yihaaa! when edited seems that it belongs to First Group, Yihaaa!
- when viewing the tasklists of Company 1 First Group, Yihaaa! is there with all tasks in it

all above can be seen in 4 images stitched together in the attached image

all the tasks of First Group, Yihaaa! appear in the taskboard of Company1
and don't appear in the First Group, Yihaaa! group taskslists

Could it be a problem with Language of each NODE ?

I can give you access to the installation if you need to investigate

or I can even create an HTML/DB zip file for you to recreate it on your own

let me know how I can be of help