Congratulations on a great loss so far! Well done!
Now that you're much closer to an ideal weight, you need to eat more, not less. Increasing exercise and reducing calories is probably why you're not losing weight now.
Instead, leave the exercise at a sustainable lifestyle level, and eat a little more as you lose, closer to a maintenance range.
Your body can't handle, say, eating 1200 calories daily until the day you hit ideal weight and then zapping overnight to 2000 calories to maintain it. Instead, as you get closer to maintenance weight, you need to eat closer to maintenance level.
Here's a tip - try setting the Spark system as if you already are your ideal weight and want to maintain it. Set current weight and goal weight to 65kg and set the goal date a year out. You'll get a range calculated to maintain that weight. Try eating in that range - and if you're still over that weight you'll be undereating enough to lose weight down to that ideal weight!
BTW, your ticker says you're over 100kg. You need to check out this article to fix that: www.sparkpeople.com/community/help_answer.