When did Instarem FX rates become so terrible?? Got charged GBPSGD rate of 1.77 on my amaze card when market rate is 1.70

Always thought Amaze fx transaction rates were competitive (similar to youtrip) until I checked what was the actual SGD amount I got charged to my card and realised it is almost 5% from market rate!! Was charged around ~1.77 for gbpsgd when youtrip is ~1.70! Will go back to using youtrip instead of using my miles/cashback credit cards and using amaze to handle fx conversion.