^^^^^ What nelie
(LOL, that seems to be a recurring theme for me, when posting after her
Hydration and even when you eat can change the BIA readings quite a bit. Don't sweat it too much.
IF, however, you are losing muscle before fat, it COULD be due to excessive exercise. Ironically, strength training and fitness regimes actually break down your muscles - it's the recovery, through time and good eating habits, that builds them back up bigger/better than before. It might be worth trying to take a day or two off a week, to give your body that chance to recover properly. Additionally, if you're healing from an injury, you might need extra protein AND calories- if you don't get a surplus in your diet, your body can start breaking down other parts of the body that aren't being 'used' as much.
The numbers I've read about suggest 1.5-2g of protein for every kg of bodyweight while recovering from injury/surgery. Does 85g hit the spot for you? Have you tried increasing
your kcal for a week or two, to see if that helps?
If you continue to consistently see muscle loss in the next 2-4 months, it might be worth sitting down with a doctor, dietitian, or fitness pro to see what you can change. Or, you can try tracking your bf% with a different method in addition to the BIA, to add some context.
At the end of the day though, you could be doing everything right, and the omron just misled you this time.