Thank you for playing the game! There should have been a notice in how much ammo is reloaded into your AK. I probably should have added a sound effect as well!
Oh it changes how much ammo is reloaded, that's an interesting twist! It kind of reminded me of gears of war, where you can let the qte run through to reload normal speed, hit the qte exactly for extra damage bullets, be a little off for a faster reload, or miss for an extra long reload/jam.