If you were doing weight training you may gain due to building more muscle, did you take waist measurements too? sometimes that can help to show you your progress if the kg are not moving.
October 2011- Weight: 94.7kg (208.78lbs)
April 2012- weight 86kg
May-June-July 2012- weight: up and down between 86.5kg and 84.5kg -stuck stuck stuck
July 2012- Joined fitday!
27th July 2012- weight: 83kg (182.98lbs)
First Goal: 80 kg(176.37lb) (reached 21st August 2012)
I HAVE BEEN OFF THAT WAGON 19th Feb 2013- 84.7kg (186.73) time to get back on!!!!!
Healthy weight range Goal: 60kg-74kg