When using a displayed but not publicized currency, the shipping amount is wrong

-- HikaShop version -- : 3.3.0
-- Joomla version -- : 3.8.5
-- PHP version -- : 7.0.23
-- Browser(s) name and version -- : multiple
-- Error-message(debug-mod must be tuned on) -- : none

• Standard install (with sample data) (HS 3.3.0) (Joo 3.8.5)
• Configure Dutch tax = 21%
• Configure manual shipping price = €5,37190 (including tax this will be €6,50)
• Show currency USD, but do not publicize it, set rate to 1.23761
• Create order with:
  • 1 Black shoes: €181,50
  • manual shipping

Results:

1. On product listing screen: "Black shoes $224.63 (181,50 €)"
2. On checkout screen: "Manual shipping 5,25 € ($6.50)"
3. 3) in database table hikashop_order:
   SELECT order_shipping_price, order_shipping_tax, order_shipping_params FROM hikashop_order where order_id = 20;
   # order_shipping_price, order_shipping_tax, order_shipping_params
   '5.25206', '0.91151', 'O:8:\"stdClass\":1:{s:6:\"prices\";a:1:{s:3:\"2@0\";O:8:\"stdClass\":3:{s:14:\"price_with_tax\";d:5.2520575948804549;s:3:\"tax\";d:0.91151412803710397;s:5:\"taxes\";a:1:{s:3:\"BTW\";d:0.91151412803710363;}}}}'[\li]

What I expected:
2) "Manual Shipping $8.04, (6.50 €)"
3) '6.50', '1.43', ... (prices rounded)

Conclusion: for shipping prices, the conversion rate seems to be inverted and on the checkout page the symbols are not consistently/correctly placed.

Thanks for your quick reaction and solution. I will try the latest version.