Was trying to saddle a Brightfield Glider in a game of draft before my combat phase. I have duplicate Unswerving Sloths in play. I saddled one of the Unswerving Sloths first with the 2 tapped creatures you can see in the photo (Swiftwing Assailant & Kolodin, Triumph Caster). I wanted to use the unsaddled Sloth Mount to saddle the Brightfield Glider next. However, every time I tried to do so, the already mounted Sloth Mount was selected. I could only select the mounted Sloth Mount first and then both, but never the unmounted Sloth Mount first or by itself. I tried tapping the cards every which a way, but was only allowed to select the mounted Sloth Mount first. I am playing on iOS on a 6th gen iPad Pro.