Hey @KatyKatyKaty .
Thanks for reaching out on this thread, and following up with us regarding this issue! The staff permission for managing inventory is found under the ‘Product’ permissions, but it’s a seperate permission from being able to ‘view cost’. You can reference this screenshot I’ve taken from my test store:
I recommend double-checking your staff’s permissions to check to make sure ‘view cost’ is unchecked, and ‘Inventory > manage’ is checked. If you continue to experience issues after double-checking this issue, please reach out to our Support Team for some assistance.