I'm having the same issue as Hakinator.
It's something that happened to me several times to me on the mobile version, using Mending and not being able to draw the card I want. I would be able to just barely select it, and it's highlighted as interactible, but there's no button to draw it and react to nothing. I can only draw a card by dragging it from the discard to my hand. Except that if the card I want is too much to the side, that's not an option, so I have to pick another one.
In this case, I'm on the Steam version, and the only card I can draw is right on the edge of the screen. I can't grab it or do anything. None of the shortcuts do anything other than occasionally producing a sound effect.
Username: Sojiro888 #1854
Characters: alt Seelah, alt Amiri
Locations: Seelah is in the General Shop, Amiri is in the woods
Turn order: 1. Seelah 2. Amiri
Scenario: Heroes of Sandpoint, normal difficulty (this pair of characters is doing it for the first time, and has only done the previous ones once)
Encounter: I encountered a few Monsters and used the location power to Explore again until I encountered a Guide, which Seelah acquired and Banished to close the location. After receiving the free item from the location closing, I tried to use Mending to swap her Superior Longsword for the Battleaxe +1 in her discard (only weapon in there)
The Steam version is not as good as the mobile one when it comes to dragging stuff around, which is usually just a bit inconvenient, but in this case it's making the game literally unplayable. After trying all the keyboard inputs I could think of and clicking everything, failing to grab everything, I eventually had to forcefully shut the game down with Alt+F4.