So even though you may be losing fat, you're gaining muscle. You might feel slimmer, even as the number on the scale rises. “The scale doesn't tell the entire story,” said exercise physiologist Christopher Mohr, PhD, RD. “Since muscle and fat take up different volume, they look very different on the body.”
yes its possible. weight can br either muscle mass or fat. so weighing more with a low body fat percentage is not only possible but also desirable.
You're losing fat but gaining muscle
 If you are eating well and going to the gym but aren't seeing a shift in the scale, it may be because you are gaining muscle, which is more dense than fat. This means you could weigh the same, even if your body composition has changed.
Muscle tissue is denser than fat, which means that even if you have a higher weight, you may still look leaner because muscle takes up less space (1). So, if you have a higher muscle mass, it can contribute to a heavier weight without necessarily looking fat.
If you've been training hard and get on the scales and see you've gained a few kilos (but still feel the same weight, or slimmer), chances are you've gained muscle mass, which is much more dense than fat.
One of the primary reasons why you are losing inches but not weight is muscle gain. Muscle tissue is denser than fat tissue and occupies less space despite potentially weighing more. It means that even if you lose fat, the increase in muscle mass may nullify the decrease in overall weight.
They may still perceive themselves as very heavy, even when the reflection in the mirror reveals a much smaller person. This phenomenon is sometimes called “phantom fat” or “phantom fat syndrome.” The medical term is body dysmorphic disorder.
How Long Does Water Weight Last? The span can vary depending on the cause. Temporary water weight caused by high sodium intake or premenstrual syndrome can last a few days to a week. Permanent water weight caused by underlying health conditions may last longer and require medical treatment.
You may be born naturally small and your low BMI can be due to your genes. You may have a very high metabolism and find it hard to put on weight, even if you eat foods that have a lot of calories. You may not follow a healthy, balanced diet because you forget to eat or cannot afford nutritious foods.
If your clothes are looser but your weight is stagnant (or you're a little heavier), there's a chance you're undergoing body recomposition, a fancy term for building muscle mass and losing body fat, says Hamilton. While building muscle is a long game, focus on resistance training and upping your protein intake.
Muscle is denser than fat, meaning a kilogram of muscle takes up less space in your body than a kilogram of fat. So, even if you gain muscle and your weight on the scale increases slightly, you can appear slimmer and more toned.
The rule of thumb, Fernstrom says, is that losing 8 to 10 pounds translates to going down one size. Still, if you lose "up to 15 pounds, you may be OK in your old size," she says. But putting off buying new clothes until you really need them doesn't work for everyone.
Tips for getting rid of water weight include reducing sodium and carbohydrate intake, drinking more water, exercising, and taking Vitamin B-6 and magnesium oxide supplements.
You can lose up to 20 pounds of water weight in one week after modifying your diet and starting an exercise routine. Trinh Le, MPH, RD, claims that up to five pounds of water may be shed in a single day.
Increased muscle mass
 After your workout, your body works to repair these tears, allowing your muscles to get bigger and stronger. So even though you may be losing fat, you're gaining muscle. You might feel slimmer, even as the number on the scale rises.
Reduce Your Health Risks
 Obesity increases your risk for many health problems. Losing the extra weight can help eliminate those health problems or lower your odds for them. Weight loss can reduce your blood pressure and cholesterol. It can also slash risk for diabetes, heart disease, stroke, and osteoarthritis.
But the problem might not be your angles, it could be lens distortion. Because of the proximity of your face to the camera, the lens can distort certain features, making them look larger than they are in real life. Pictures also only provide a 2-D version of ourselves.
A planned cheat day can sometimes shock your body into breaking through the plateau and going back to weight loss mode. It can also give you a mental break from being so careful with what you eat. Finally, a cheat meal gives you the chance to eat some of the high-calorie treats that may have been scarce recently.
Your Body Is Extra Prepared for Your Second Try
 If you've lost weight in the past by exercising or changing your diet and try to use those strategies again to lose weight, your body ndash; mainly hormones and metabolism – will adjust to prevent similar damage and you'll see fewer weight loss results.