How do you know the humidity is not changing over time? Or are those values measured over a period of just a few seconds?
What sensor is it? What is the accuracy spec of that sensor?
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@Paul-Reed Yes! this morning I've put it in a relatively dry soil after few hours the readings went up to 80% 
@Colin those values were measured each 30 sec I'm using a capacitive soil moisture sensor v1.2.
When the sensor is in the air it gives stable values but when it is in soil the readings are just irrational, I saw someone that covered the edges with nail polish so I'm tinking about doing the same
It will just keep increasing 
By comparison, these are my sensor readings which are taken every 60 seconds, scaled and fed into the RC Filter, which in turn creates an output to the PID every 10 minutes;
Reading: 532
Reading: 533
Reading: 534
Reading: 533
Reading: 532
Reading: 533
Reading: 532
Reading: 533
Reading: 534
Reading: 534
Reading: 534
Reading: 532
Reading: 532
Reading: 533
Reading: 534
Reading: 533
Reading: 533
Reading: 533
Reading: 534
Reading: 533
Reading: 533
Reading: 533
Reading: 533
Reading: 533
Just to make sure, is your sensor is exactly this one ?
Yes, it's the same.
Are you taking just a single reading?
I've programmed my ESP to take 10 readings in rapid succession, and then average them before sending them to node-RED, which gives a much more consistent reading.
I also remove any 'out of range' values (minHumidity & maxHumidity).
unsigned int readhumidity(){
unsigned int numval = 0, tmp = 0;
sval = 0;
for (int i = 0; i < 10; i++){
tmp=analogRead(analogPin);
Serial.print("analogue read is ");
Serial.println(tmp);
if (tmp < minHumidity && tmp > maxHumidity) {
numval++;
sval += tmp;
Serial.print("Sum of humidity reading is ");
Serial.println(sval);
}
delay (10);
}
if (numval > 0) {return (sval / numval) * 10;
Serial.println("No Humidity data to display");
}
}
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I do average them but the raw readings are just choatic and decrease for no reason so I think I'm going to get a new sensor 
By way of encouragement....
I've just returned from a 3 week trip to Florida, and totally relied upon node-RED to care for my chilis, peppers and tomatoes, and it worked just fine, same as last year.
The soil humidity was about the same as it was when I left, despite the plants being 500mm taller & bushier, and looking very healthy.
My garden is alarmed and secured, so I can't rely upon a neighbour to do the honours, and in previous years I can't tell you how many times I've returned after being away, to find either dead, or dying plants.
It's well worth the effort.
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I don't display my data like that any longer, so can't share the code... but,
Using a function node with 2 outputs;
Output 1
I made zero the first value passed as an output, followed almost immediately by the actual chart value. This was fed into the chart node.
Output 2
I made the actual chart value the first output, followed almost immediately by a zero. This was also passed into the same chart node via a delay node set as 1 minute.
So, this resulted in the chart node being fed;
0
57
(wait 1 minute)
57
0
Which squared off the chart .
In the top chart above that you posted, the delay node is set to a minimum value, and ticked 'enlarge points' in the chart node settings.
OK it's noted .
maybe you could show us the last update of your Dashboard on your smartphone? It could give ideas 
How do you do not display the address bar on your Android dashboard? I have this permanently with Chrome Android:
Because I open the website as an app, which is full screen. Just go to your phone's browser menu and save the site to your phone's desktop.
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so simple that I had not thought about it !
are not you in wifi? you go through a tunnel? ngrok?
We're moving O/T here, but...
I use Cloudflare's DNS resolver on my mobile devices.
I'm looking forward to getting Cloudflare Warp, but I'm currently applicant number 1,284,841 on the waiting list!
hi
I did the same steps as you but my work does not work well 
... that I have not used PWM for the pump !!
