PV array current unstable for one array and stable for the other array

Hi, I need help with the following part of my model, containing 2 PV arrays (PV3 and PV4) and a battery.

Why does the PV current signal for PV3 (Ipv3) present strong fluctuations while the same signal for PV4 (Ipv4) remains stable ? What can I do to make both signals stable ? I need this to ensure stable produced PV power for both arrays.

I don't know if the slx file is needed. If so please let me know and I'll share it.

Any insight would be highly appreciated. Thank you!