Darius Gameplay Bug

Recently when I've played Darius using the Dunkmaster Darius skin, I've noticed something wonky going on with my movement and my attack. Specifically, when I right-click to have Darius go attack a creep or a champ, it'll turn into an attack-move with the sword icon... and Darius won't attack anything. He'll just walk around. During laning on SR or early-game on HA, this isn't a huge huge issue, as a left-click will remove the effect and I'll be able to carve a path as I desired. But during teamfights, or tense situations like a gank, it can take me a moment to realize what's happening, and instead of reacting to the situation, I'm left frustrated that Darius isn't doing what I want him to do. Not sure what might be causing the issue, and I haven't played Darius with other skins to see if it's specifically endemic to the Dunkmaster skin, or just Darius in general. Didn't see a thread raising this issue, and it's only recently that this popped up.