Tx Costs Question about Wallets

Hope y’all are having a good week. I come here to ask a simple question …
I’ve just recently adquired a Ledger NanoX, I paired it up with Daedalus and got started.
Whilst doing my initial transfer for testing. It cost me 0.18Ada to send From Daedalus to the Ledger one and then to send it back it cost me 1Ada. Does anyone have any information regarding why did it cost differently?
Also, If anyone else has a ledger NanoX, should the device ask to export keys every time I want to do a Tx? Is this normal procedure?

Anyways, Thanks in advance for your feedback
Have a good one