Why does this happen?

[Die Uwe]

!
/facepalm

Oh wow. You have no comms between your battery's BMS and inverter. No wonder it's playing silly buggers, get your installer back to fix it pronto.

I opened the inverter, they never plugged in the can cable. Here is it now

 

[Die Uwe]

@RonSwanson so what can I safely change the Charge rate to now please?

 

[RonSwanson]

I opened the inverter, they never plugged in the can cable. Here is it now

Probably a virgin RJ-45 crimped by a rookie sparky, the anti-pull clip wasn't bent backwards so it slipped out.

Lekker man! Happy days!

 

[RonSwanson]

@RonSwanson so what can I safely change the Charge rate to now please?

2x AM-2s can charge and discharge at 1C so 200A is safe for both charge and discharge, as the BMS states.
Your 5K inverter will never get to those rates though, it's limited to 120A for both charge and discharge. So great for longevity as is.
If you want them to last even longer, discharge at 120 and charge at whatever you feel comfortable with, 120A is very safe (60A per battery), but you can go even lower, maybe to 50A per battery. But if set too low, you may miss out on some peak charging juice on a cloudy and windy day, where the clouds move quite fast and you need a quicker charge.
I do my 3x AM-2s at 100A (33A per battery) but then again it works well for the location at the coast.

 

[Die Uwe]

Okey awesome thanks. I will set mine to 80 and check it for a few weeks.