Thats all well and good
One way to uncurl your cards is to place them under a heavy book to flatten them out
Alharu, Solemn Ritualist Amarant Coral Azusa, Lost but Seeking Azusa, Lost but Seeking Dosan the Falling Leaf Elsha of the Infinite Elsha, Threefold Master Erayo, Soratami Ascendant Guru Pathik Homura, Human Ascendant Ishai, Ojutai Dragonspeaker Ishai, Ojutai Dragonspeaker Iwamori of the Open Fist Kuon, Ogre Ascendant Lyse Hext Monk Gyatso Narset, Enlightened Exile Narset, Enlightened Master Narset, Jeskai Waymaster Oji, the Exquisite Blade Rasaad yn Bashir Rune-Tail, Kitsune Ascendant Sabin, Master Monk Sasaya, Orochi Ascendant Seshiro the Anointed Shu Yun, the Silent Tempest Siani, Eye of the Storm Snow Villiers Stick, Fearless Mentor Taigam, Master Opportunist Taigam, Ojutai Master Tifa Lockhart Tifa, Martial Artist Zedruu the Greathearted Zell Dincht
That's the reason for the discrepancy
You will often see mats at about 24 inches by 14 inches
Table of Contents show What is Equipment in MTG