Applying a coupon (%) – currency bug

Hi,
I′m using woocommerce Coupon in order to create Coupons for certain products.
Discount type: Percentage discount
Coupon amount: 50 (%)

When I enter the coupon during check out, it would show -€50 even so it does apply the right amount. Meaning 50% of the sales price. How can I fix the issue, that it does show -50% instead of -€50. Thank you very much in advance.

Coupon code to enter is “150”.

### WordPress Environment ###

Home URL: https://brumbrum.me
Site URL: https://brumbrum.me/pix
WC Version: 3.3.4
Log Directory Writable: ?
WP Version: 4.9.4
WP Multisite: –
WP Memory Limit: 256 MB
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WP Cron: ?
Language: en_US

### Server Environment ###

Server Info: Apache
PHP Version: 7.0.28
PHP Post Max Size: 8 MB
PHP Time Limit: 30
PHP Max Input Vars: 1000
cURL Version: 7.29.0
NSS/3.28.4

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### Database ###

WC Database Version: 3.3.4
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brum_woocommerce_order_itemmeta: Data: 0.14MB + Index: 0.14MB
brum_woocommerce_tax_rates: Data: 0.02MB + Index: 0.06MB
brum_woocommerce_tax_rate_locations: Data: 0.02MB + Index: 0.05MB
brum_woocommerce_shipping_zones: Data: 0.02MB + Index: 0.00MB
brum_woocommerce_shipping_zone_locations: Data: 0.02MB + Index: 0.05MB
brum_woocommerce_shipping_zone_methods: Data: 0.02MB + Index: 0.00MB
brum_woocommerce_payment_tokens: Data: 0.02MB + Index: 0.02MB
brum_woocommerce_payment_tokenmeta: Data: 0.02MB + Index: 0.03MB
brum_woocommerce_log: Data: 0.02MB + Index: 0.02MB
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brum_icl_translations: Data: 0.02MB + Index: 0.06MB
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brum_links: Data: 0.02MB + Index: 0.02MB
brum_options: Data: 2.13MB + Index: 0.05MB
brum_postmeta: Data: 1.52MB + Index: 0.77MB
brum_posts: Data: 0.33MB + Index: 0.13MB
brum_termmeta: Data: 0.02MB + Index: 0.03MB
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### Post Type Counts ###

acf: 9
attachment: 302
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feature: 3
feedback: 2
nav_menu_item: 7
page: 16
post: 3
product: 22
revision: 129
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shop_order: 85
shop_order_refund: 1
wpcf7_contact_form: 2

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Overrides: brumbrum/woocommerce/archive-product.php version - is out of date. The core version is 3.3.0
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