Hello again Nikki! You say that if you weigh yourself, then 2-3 days later, your weight increases by a kilogram or two. Given that it is very unlikely that you've put on that much fat, I'd say that there are two possibilities. First, scale error. Your scales can have a mind of their own, they can go up or down at random and it can be really confusing. My solution to this is to weigh daily, and when the scales jump by 1kg (in either direction), I pretty much ignore it. Suppose you weigh in at 85.0 kg and then the next day you are at 84.0 kg. That's highly unlikely that you're at that weight, so I just give a maximum of 200g per day change (in either direction). So you'd write down 84.8kg. This cuts out most scale error.
Second, it could be water retention. If you eat lots of dry or salty foods, then your body will retain more water than usual, and your weight will show the difference.
Apart from that, I still recommend the whole counting kilojoules and weighing everyday. Sure, it's a pain but it's worth it, just while you're on a plateau. When losing weight I still weigh daily, and it's part of my motivational system. I need to know within 2-3 days when I'm not losing, and weighing daily tells me.
Good luck and keep in touch here.
Heaviest weight: 94kg
Goal weight 66kg