Currency Missing from Custom Conversion

Hi there,

I’m having trouble with one of my custom conversions. Facebook says that there is no purchase currency parameter set.

However, when I look at Pixel Helper, or at the code in Pixel Caffeine, the currency is shown.

Do you know what might be going wrong with this?

Screenshots below.
https://snipboard.io/8fuSPI.jpg
https://snipboard.io/iCJdMx.jpg
https://snipboard.io/7LQDk5.jpg

Thanks,
Nicola

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