Selectbox options not translated on WooCommerce product detail page

I have a variable product with different options. Although I’ve used TranslatePress to translate the options, they are still blank.

When I inspect the selectbox in de web inspector from Chrome, I can see that the HTML attribute values ARE translated. But the text is not (it’s still blank).

I’ve tried removing special characters like the € sign etc. But that didn’t help. And I’ve also tried using just one character per option (A, B, C, etc.), but still no translation (just a blank option).

Seems like a bug. Please fix it asap.

The page I need help with: [log in to see the link]