What you weigh is almost meaningless. As said, muscle weighs more than fat per unit volume. What percent body fat you have the numbers you should be concerned with.
Besides all of that, what you may be seeing that you have reached what is called a plateau. That is, your body has adjusted to your “new” diet and level of exercise. In order to continue to lose body fat you will need to re-adjust you caloric balance. In other words, kick it up a notch and eat less!