Something is not right ....can you tell me

Less than 1000 calories every day is not healthy. If your goal is to get ill, you're on the right track. If your goal is to get healthy, you need to revise your calorie goal upwards and look at the content of your food.

6lbs in a month is a good loss. At so little calories, your body will be becoming more efficient with small amounts of food and weight loss can be slower. Also, as you reach closer to goal, weight loss can take a lot longer to lose healthily.

Stop fretting about lean body mass short term and give your body the food it needs to survive, and help stop your body eating up what lean body mass you already have, as that's a larger part of what you'll lose if calories are too low. Do some exercise to help keep muscle mass too.

Good luck. Many of us have tried your way over the years and regretted it a few decades later.

Eating in that range, you are losing so much muscle, not only fat. Please consider eating at a more healthy range.

Yes, there is something not right, you are losing far too fast. Your deficit is far too big and much of what you have lost is lean mass, muscles and the like, not fat. Redo your calorie goal with MFP with a goal lose of no more that one pound a week, even that is likely too aggressive, then eat your calorie goal.

OP, as a male, you should be eating a MINIMUM of 1500 cals. You lost the weight crazy fast at first, you are now losing weight at a healthier rate. You were probably losing a lot of muscle that first month and risking your health. At 5'11" 183 lbs you are just outside of the healthy weight range, so you should be aiming for 1 lb loss per week and working hard to maintain whatever muscle mass you currently have.

You are eating less calories than a short thin woman should be eating. Please fuel your body and start prioritizing your health. Best of luck.

@Coloneyhatch You have forced your NEAT to fall. That is "metabolic damage". You've damaged your metabolism. That is what is wrong. As your NEAT falls, your BMR and TDEE also decline. The calorie deficit you could achieve with the same very low calorie intake shrinks, and your weight loss does slow.

Despair.com has a demotivational poster of a sinking ship captioned, "Your life may only serve as a warning to others".

All is not actually lost. You can allow your NEAT to rise to a normal level, but the only way to do that is to raise you intake calories to the MyFitnessPal maintenance level for your weight today. Your NEAT will return to normal after several weeks. Eat at maintenance for a month. Then change your weight loss goal to lose 1 lb per week. then eat every bit of that number. Otherwise your life will serve only as a warning to others.