They say InBody measurements can be inaccurate, but...

‌I started working out and dieting on August 1st, so I took an InBody measurement then and just re-measured today after one month.
Height: 168cm (Male)
Weight: 77.2kg -> 75.7kg
Body Water: 39L -> 37.7L
Skeletal Muscle Mass: 30.1kg -> 29.1kg
Body Fat Mass: 24kg -> 24.2kg
BMI: 27.4 -> 26.8
Body Fat Percentage: 31.1% -> 32%
I couldn't work out as intensely as I thought I would, but since I've been sticking to my diet, I was secretly hoping for better results.
However, I only lost muscle (body water decreased similarly) and my body fat mass actually increased by 0.2kg.ㅠ
I'm debating whether I should increase my cardio time, train harder, and eat more protein.
Currently, my diet consists of banana & whole wheat bread (1 slice of cheese, a little corn) for breakfast, a regular meal for lunch, and chicken breast & tomatoes for dinner.
But I haven't been able to train too intensely because I'm worried it might interfere with my delivery work.
Last month, I measured after exercising, but today I measured before exercising.
I should use measuring before exercise, like I did today, as my standard and check again next month.