Hello there @TYUHYUN, @bielik01 & @BearHunter21!
Thanks for sharing that video with us, @TYUHYUN! I wasn't able to find any other reports of this behaviour, so I've now forwarded this to the dedicated teams to take a closer look at. They'll also be able to let us know if you should be able to purchase materials from Kara, or that being unable to purchase materials working as intended.
If we require any additional information from your experiences, we'll reach out within this thread. If we have any updates to share with you regarding Kara's stock, we'll let you know within this thread as well.
Thanks!