The showed average prices coming from cardmarket isn't corresponding the price on the site.
For Magus Lucea Kane, code card 174 ( https://www.cardmarket.com/en/Magic/Products/Singles/Universes-Beyond-Warhammer-40000/Magus-Lucea-Kane-V2 ) i have a price of 34,50 euros but this price match with the 7/168 card ( https://www.cardmarket.com/en/Magic/Products/Singles/Universes-Beyond-Warhammer-40000/Magus-Lucea-Kane-V1 )
Another exemple for Firkraag, Cunning Instigator, code card 648 ( https://www.cardmarket.com/en/Magic/Products/Singles/Commander-Legends-Battle-for-Baldurs-Gate-Extras/Firkraag-Cunning-Instigator-V1 ) showed an average price of 18,77 euros but online none of the three versions of this card (642 & 933) cost this much (3,26 euros max).
Another not related problem is that when clicking on card and clikcing cardmarket to reach corresponding link on cardmarket it show an error (seems happening mostly on CLB, Baldur Gate's or 40K, Warhammer or BRO, Brother's War extension cards).
For information i use the app in french and my cards are marked Fr too.