Currency in mail confirmation with PayPal

I use Booster for WooCommerce (2.7.0) and I have two currency set (CHF and EUR). I have the issue that users who choose EUR on the checkout and pay with PayPal they receive the confirmation mail with CHF, even if all prices in the cart, on the checkout, in PayPal and on the confirmation page of WooCommerce are displayed in EUR. If the use another billing, the currency is correct. I assume that this is due a bug on Booster.