Help!
I had weight, fat percentage and muscle mass measured at my gym a month ago, and then again yesterday.
A month ago:
88.6kg
37.7% fat
52.4kg muscle mass

Yesterday:
84.5kg
37.8% fat
50.0kg muscle mass

Have never measured al this before:
Am I right to be worried about loss in muscle mass?
I've been strength training about 50 mins x 3 times a week, not much cardio
I'm eating under 30 carbs per day, mostly green leafy veg - is this ok?

I was feeling really good before I went to get measured - I know I am smaller, and was really surprised to be told I've lost muscle mass.

All opinions comments and suggestions gratefully received.