Confused after weight/body scans with Omron HBF-516

[DaveOnSound]

Earlier this year I started really getting intentional about my exercise. Most mornings every week I will take a brisk 5km walk and average about 9-11 min per km. I have supplemented this with my own workouts at home ranging from workouts with the Freeletics Bodyweight app, my own recipe of exercises, and some other Youtube workouts. I also do an occasional paid workout with a personal trainer friend. I have dropped at least 4kg's and experienced (positive) visible changes in my physique and muscle tone. 
In April I used this PT's scales to see what my body was like according to a more expensive and detailed set of scales to the ones I use regularly at home. The readout was interesting and challenging in the visceral fat and body age results. 
Fast forward to yesterday, and I hopped on those same scales for a check-in. I found the results interesting. I had lost 3.9kg's since the last time, my BMI, Body age and Visceral Fat had also decreased. The confusing part is the Body Fat percentage actually increased by 0.4% and my muscle mass decreased by 0.3%. I kept the scales to try again this morning. Again, weight, BMI, Body age and Visceral fat had decreased further, but the muscle mass decreased another 0.1% and body fat increased by 0.1%.

Granted, the readings should be taken at a controlled time of day, and that's what I will be doing moving forward, it's just rather confusing to be seeing such visible changes that I'm really happy with as a work in progress, but have readings that suggest differently in some ways.

Does anyone have any thoughts?

A link to the spreadsheet I've started with the info can be found here: 

https://docs.google.com/spreadsheets/d/1RCCvHr3MqH82uneLe-mUuY2uSfc7rEZA-Amg9dhE-9s/edit?usp=sharing

[Baltoscott · Accepted solution]

Hi @DaveOnSound I think you just don’t have enough data points.  If you check out the TrendWeight link in my signature, you will see about 6 or 7 years of daily weigh-ins.  Drill down to any two-week segment, and you will see quite a bit of variation not only in weight, but in lean body mass and fat mass day to day.  Even though I weigh in the same time every morning, there is just a tremendous amount of variation due to hydration levels, and the fact that it takes about 4 days for your body to fully process any particular meal you eat.  

If you do daily weigh-ins on a scale that also measures fat percentage the variations tend to average out over time giving you a useful view of the direction of your efforts.  I like TrendWeight’s moving average, but the weekly average that Fitbit puts in the app is useful too.