UBS TWINT - addition 2chf showing up in "final amount" but not transaction history

I’ve recently noticed with UBS that when I purchase something with TWINT (eg Galaxus) , the “final amount” shown in the confirmation screen is always +2chf , but the amount in the transaction log is always the purchase amount. Does anyone else have this issue?

Isn’t it “pay two francs more if you want 30 days deferment on the payment” ?

You only pay it if you slide the slider across.

Yes that is what I thought. I don’t know if it is a bug in my app, as again, I don’t see this charge anywhere in my statements, only on the confirmation screen. I never select the deferred payment, although on my app, I cannot delete this as a payment choice.

Might be caused by this, or something similar: