It says the guest will get a full refund of the nightly rate if cancelled 14 days prior to check in.... it’s what it says.. I don’t understand what you are disputing. Take it up with Airbnb..
its 50% if cancelled 7 days prior to check in.
the grace period is for a FULL refund including service fee is cancelled within 48 hours.
The fact I escalated this to a different department and they honoured my refund straight away is testament to the fact the information customers are given surrounding cancellation is misleading and for that exact reason Airbnb also refunded my service fee.