Currency not changing for custom attributes

We use this plugin – WooCommerce Pre-orders – https://woocommerce.com/products/woocommerce-pre-orders/

There is a field for upfront fee which is part of the attribute for a product.

This upfront fee is not getting converted when currency is changed. Could you please check and resolve the issue ? or let us know an interim fix until you can actually have an update ?
screenshot of the attribute I am talking about – https://d.pr/free/i/771OTa

If its not something you cannot update soon or let us know a resolution, then we would have to request a refund since we want this working.