Second regulator pressure gradually increases

Hello all,
FX Maverick Sniper, cal.22, I'm newby to PCP.
I exchanged the original FX gauge for a digital gauge from AliExpres in the Zengfu Store,
After pressurizing the FX Maverick (220 Bar bottle), the digital gauge displayed first regulator 140.0 Bar, and second regulator 100.0 Bar. After about one hour second regulator displayed a pressure of 101.2 Bar, after another hour 101.4 Bar, after the third hour 102.2 Bar ....
I left the gun pressurized and the next day it displayed a pressure of even 105.8 Bar.
Then I stopped testing and decompressed the rifle. I did not shoot during testing.
I don't think it's something tragic, but I was intrigued, do you have a similar experience?
Where could I get the problem ?
As if the second regulator gradually released the pressure into the Power Plenum ...
Should I check and repair the second controller or not to solve this relatively small problem?
The Maverick is brand new, only 4 magazines shooting so far and it shoots like a charm.
Wiil be glad for any advice and opinion.
 
Slow pressure rise is a classic case of regulator creep. (Temperature rise will do it too but I’m assuming that wasn’t the case here.)

https://www.airgunnation.com/topic/how-to-fix-reg-creeping/#post-461772

A few bar is nothing to be concerned about. When the gun is adjusted properly, it will have no negative influence on velocity (extreme spread).

Your gun being so new, the regulator’s seat may not yet be “ironed in”. Usually a regulator will improve in the early going as it breaks in. Eventually, usually after many thousands of shots, the seat will wear and creep will begin to grow.


 
Thank you very much for your answer and advice, I appreciate it, immediately started studying the link you attached.
I learned a lot of interesting information about creeping problem.
On your advice, I'll leave it at that for now.
I'll shoot, test the speed and accuracy of the shooting.
I believe that the regulator will improve.
Thank you very much again, have a good time and successful shooting.
 
Hi all,
I pressurized the rifle again, raised the second regulator to 105 Bar, shot three magazines and left it at that for five days.
After five days the gauge shows a pressure of 106,2 Bar, I am very satisfied.
I think I can close this topic by saying that the rifle is fine at the moment.
Thank you all especially to @nervoustrig for your valuable information and help.