the way you have mentioned your problem it does not seem that you have turned eccentric. it seems that you are in a tremendous hurry and the quicker you are into your next task, the more relieved you feel. therefore, you may not consciously remember to take off the other shoe. when you find what you have done, you find it surprising and start thinking that something mystic is happening with you. keep cool. go slow. take a break from work or study (you seem to be a student). hope you will fell all right.
you may try some software that would help you in mind control. MB Subliminal Message Software is a good one. know about it at
http://www.mysticboard.com/mb-free-subliminal-message-software/