Bug in Darius Gameplay

I was in a normals game play darius for the first time I would click to attack a champion and then i would click away and i couldn't stop attacking the champion they did not have a taunt ability. I died under turret and came back into lane, I once again did the same thing, attack used my combo and went to walk away and i couldnt just kept basic attacking...... I started spam clicking my mouse and nothing happened. I spam clicked my touch pad on my laptop and after about 5-7 seconds of spam clicking on the touch pad i disengaged from the champion I was attacking. This continued all game long. I played a seconds normals game figuring it might have been a fluke when the EXACT same thing happened. After that game i shut down my laptop and brought it back up and decided to play a ranked game with evelyn and had no issues at all. I figured it must have been my computer, UNTIL i decided to take darius into a ranked game when the EXACT same thing happened, I have since played several different champions with no issue at all.