Curve changing auth amount for petrol

Is this usual?

This is at our local ASDA.

The terminal says ‘Authorising £1’.

If I use my debit card or credit card directly (both HSBC) a £1 auth appears on the card.

If however I use my Curve card linked to said credit card, Curve and the credit card show a £50 auth.

Not the end of the world, but is this usual? It could cause issues if close to limits.

4 posts were merged into an existing topic: Fuel Payments - £50 authorization