Display battery bars stick, HV battery charging normal.

I reconditioned my battery pack, it is very strong now as far as AH capacity. My display will stick at 3 bars and sometimes at 1 bar and won't go back up even though the hybrid battery is charging properly.

If I unplug the Battery ecu to reset it, it makes the bars un stick and show a charge almost full. Then if I let the car sit with it on and the ac running, it very slowly starts losing bars and it will either stick again at 3 bars or go down to 1 bar, if it ever moved from 1 bar it never goes above 3 bars.
So anyway the battery module is not the problem because I replaced it and it does the same thing. But the Battery module is causing the issue, maybe because of signals it is getting, it freezes up.

I was messing with till dark, it was then I noticed although my 12v battery had a charge of over 12 v, the interior lights seemed dim, then when I pressed the start button and the computers all powered up, the lights got real dim even though my voltage at my 12 battery was holding over 12 volts..

I quit because it was dark out, but I am wondering if the problem might be my 12V cable going up to the fuse box has resistance or a bad connection so all my computer modules when powering up are not getting the volts they need to operate.

But what is confusing is when the inverters buck module kicks in 14 volts to charge the 12 v battery, It seems that would eliminate the low voltage problem. I guess it depends on where the bad connection is if there is one and where the inverter taps into the 12v cable.

One of my hybrid battery cables going to the safety switch had some corrosion on the terminal, when I stripped the casing off, the whole wire had green corrosion.under the orange rubber . I am wondering if that can be going on in my battery cable that goes the length of the car. Guess I will find out when I get some daylight. I am just grasping straws till I get my Techstream program running on my Laptop. Has anyone else had this issue?