A full screen screenshot, even with a blank canvas, has a large amount of potentially useful information.
That is why I and other people often ask for one to be uploaded.
Your tablet tester record shows that your stylus/tablet is providing a definite 0.0% pressure signal.
Here is a record from my tablet tester using the stylus:
Pen tip brought near
Stylus press X=132.43 Y=44.28 B=1 P=42.8%
Stylus move X=131.42 Y=43.74 B=1 P=49.2% (DRAW)
Stylus move X=130.07 Y=43.20 B=1 P=49.7% (DRAW)
Stylus move X=128.22 Y=42.66 B=1 P=51.1% (DRAW)
Stylus move X=126.71 Y=42.56 B=1 P=56.6% (DRAW)
Stylus move X=125.53 Y=42.34 B=1 P=60.5% (DRAW)
As you can see, it says it’s a stylus and gives a definite pressure signal greater than 0.0%, as it should.
It seems that your stylus/tablet is behaving strangely. It’s half way between a mouse and a stylus and is giving a 0.0% pressure signal.
The Basic-1 brush preset ignores pressure signals and always paints with full opacity and size. That is why it works for you.
Many brush presets use the pressure signal to control opacity or size and so will not make a mark if given a definite pressure signal of 0.0%
Along with your other topic about a problem with the H 420 tablet,
( Huion H420 Tablet not working ),
this may need investigation of your tablet driver and setup configuration.
I can’t do that right now (bedtime) but I’m sure someone will be along to ask more questions and give advice soonish.
Note: the first 10 lines of your tablet tester record are all that is needed.
Can you edit your post to remove the rest of them to make this topic easier for people to read?