Free-fat mass (FFM) was 50% of my total weight loss last month--is this normal?

I am 5'7 F and I have been working out consistently (Burn Boot Camp classes) and eating a caloric deficit for about 2 months. My stats for the first month were great and I lost 8.6 lbs of FAT and 10.2 lbs overall (84% fat loss) with 1.6 lb FFM loss (16%) :
Month 1
Weight: 192.2 -->182.0 lb
Fat %: 40.8%-->38.3 %
Fat Mass: 78.4-->69.8 lb
FFM: 113.8-->112.2 lb
Total body water (%)82.0 *42.7%) --> 80.6 lb (44.3 %)
BMI: 30.1-->28.5

I lost almost the same amount of weight in Month 2, but notably much more free fat mass was lost than last time. I only lost 5 lbs of FAT and 9.2 lb overall (54% fat loss) with 4.2 lb FFM loss (46%):
Month 2
Weight: 182.0-->172.8 lb
Fat %: 38.3 %-->37.5 %
Fat Mass: 69.8-->64.8 lb
FFM: 112.2 lb--> 108.0 lb
Total body water (%): 80.6 lb (44.3 %)--> 77.2 lb (44.7%)
BMI: 28.5-->27.1

Can someone explain if this is normal and why this occurred? Should I be concerned? I try to workout in a fasted state because I read that you burn more fat this way--is that a problem? I feel like my muscles got visibly bigger and I feel stronger, but it appears that I have lost muscle mass over the past month.

submitted by /u/pharmkitten
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