Your PPOM plugin is blocking the update of shipping options after entering a valid zip code.
On the checkout page shipping options change accordingly to the zip code the customer enters. When I turn off your plugin, the shipping options are updated immediately with the input in the ‘postcode’ field. When I turn your plugin on, it isn’t updated.
Just put something in the cart and then go to checkout.
When you fill in the field ‘postcode’ the ‘verzending’ (shipment) options should change.
when it’s for instance 5621AB it will be ‘zone A’ -> €4,50
when it’s for instance 5661 AB it will be ‘zone B’ -> €9,50
when it’s for instance 5551 AB it will be ‘zone C’ -> €12,50
it works fine when I turn off your plugin, but not when it’s turned on.