It looks like select Gillette products have double promo's applied to them, resulting in a larger than normal discount. Look for the items with the 'Buy 1 get 1 50% off' tag
Buy 1 get 1 HALF PRICE Gillette Offer ends 15/03/2022
Buy 1 get 1 HALF PRICE Gillette and Oral B Offer ends 29/03/2022
For example Gillette Fusion 5 is $27.20 each.
Adding 2 of these into your cart results in a total of $34
Or Gillette Mach 3+ razor is $11 each
Adding 2 of these into your cart results in a total of $13.75
YMMV but i managed to price match the Mach 3+ with Pak'n'save and purchased 4 sets of razors for $17.19 delivered (combine this with free shipping code above)