I became a really bad procrastinator after being a university professor (I am slowly getting over his). What caused this was being given tasks that changed 3 or 4 times before the deadline and/or were not missed if they weren't done.

Administration would give me tasks to do, then change them multiple times, and finally do nothing if I didn't do them 95% of the time. I got to the point where I could not complete any paperwork unless someone from admin was standing beside me saying this had to be completed that minute or else the university was shutting down.