Weird HSD behaviour

Hello everyone and greets from Italy.

I've recently started to notice an unusual behaviour in the energy monitor on the screen of my 2008 Prius.
I bought it in December 2024 but since then there was nothing to report about the hybrid system, until now.
Basically, as far as my experience with this car, there is always energy coming back and forth from the battery, but in my case it happens only when regenarating/recharging.
It all began almost right after I installed and Android stereo with CarPlay, with a preassembled wire harness and a small resistor for steering wheel aircon control retain. As soon as I noticed this issue I swapped the new radio with the original one but nothing changed.
Then I checked the secret menu in the car and found some errors but apparently all related to the stereo swap and nothing else.
I also checked the 12v battery voltage but it looks good even with the car off.
Honestly, I don't know what to do at this point, and I really hope that it's not about the HV battery modules.
Attached here are some pictures and screenshots (sorry for the italian).
I have some videos but cannot post any link since I don't have enough message history at the moment.

Thanks in advance for any help!

 

I really hope it won't be necessary..

Here are a couple of videos i took while driving:

Energy meter 1
Energy meter 2
Dr Prius app