MPPT 100/20 dropping to 0 watts every 10 minutes

Hi, I have been using a Victron MPPT 100/20 for the last 3 months. I got another portable solar panel so that I can run two in series, to change at 20 amps. All good. One is a Nextgen Ecoflow 160W panel, and new one the bifacial 160W Ecoflow panel.

What I noticed with the new panel is that every 10 minutes it drops to 0 watts, and then a while after ramps up again. Two other panels never did that.

Connected in series with the other 160W panel, and I still see the drop, but clearly other panel does not drop.
Same when I run them alone, bi-facial one drops every 10 minutes, but other one not
According to this link it’s normal, but I don’t think so, why does the other panels not do that?

https://communityarchive.victronenergy.com/questions/192816/mppt-drop-outs-every-10-minutes.html