cannot add new currency for a product

Hello

I am trying to add a new currency to a product

The product is avaliable in multiple sizes.

I click the product, then edit the size.

i click the + new currency link

select United arab emirates (UAD)and enter the price

i click publish

when i go back to edit the size the new price i added has disapeared.

how can i fix this?

https://ww.wp.xz.cn/plugins/wp-e-commerce/