Currently my Logitech M720 is experiencing a weird issue in Hearthstone. At first I thought it was an issue with the mouse, but it hasn’t surfaced anywhere else. The mouse is paired to two different PC’s and does not exhibit the behavior on either, except for Hearthstone itself. I went so far as to report this to Logitech before I realized the behavior is isolated to the game client.
That’s a long explanation to get to my point: When I try to click and drag, the game registers that I’m releasing the mouse button early.
Update: A reinstall of the game fixed this.
Update 2: After about 30 minutes of play, the issue returned.