Purchase event doesn’t work anymore

The purchase event doesn’t work anymore when placing a test order (without real payment, it’s a pay at pick up test order).

The checkout url looks like this:
https://www.itgigant.nl/checkout/order-received/6954/?key=wc_order_EeUrJgGSGW3F3&utm_nooverride=1

The Pixel Helper tool says this:
We detected event code but the pixel has not activated for this event, so no information was sent to Facebook. This could be due to an error in the code, but could also occur if the pixel fires on a dynamic event such as a button click.

The injected code by the plugin looks like this:
fbq(‘track’, ‘Purchase’, {
“source”: “woocommerce”,
“version”: “4.6.1”,
“pluginVersion”: “2.1.1”,
“content_ids”: “[\”1050106_377\”]”,
“content_name”: “[\”Gembird CK-WW100-01 schermreinigingsdoekjes 100 stuks\”]”,
“contents”: “[{\”id\”:\”1050106_377\”,\”quantity\”:1}]”,
“content_type”: “product”,
“value”: “7.99”,
“currency”: “EUR”
}, {
“eventID”: “234ac664-1177-4122-ae71-c39b095b4a81”
});

All other events are working correctly and are being sent to Facebook.

I hope someone can help me, thanks in advance!

Damian