Game acts like shift is stuck

While playing, randomly the game will treat you as if your shift clicking, making it unable to craft, and drag items around. This occurs in all gamemodes. It Happens randomly and you cannot trigger it as far as i know.

What I expected to happen was...:
the ability to drag items and Craft

What actually happened was...:
It acted as if i was shift clicking.

Steps to Reproduce:
1. This bug appears randomly and can be fixed by x-ing out minecraft and then re-opening it.
2. ...
3. ...