Turning on my power strip trips the breaker, despite low power usage

Trying to understand what's happening in my setup. In my "homelab", I've a bunch of small devices and a few "heavier" ones (incl. one PC, two big external HDD cases, a 2D and a 3D printer,...) . They're all connected to two daisy-chained power strips. I've been taught it's a bad practice, since it can easily lead to having too many power hungry devices on one wire - so I measured the total power usage there, and it never goes over 600W. I have 16A breakers (with 230V it's 3680W), so I assumed I'm way under the limit.

One weird thing happens though - when everything is off, simply turning on the power strip trips the breaker. Even though all the devices are obviously off (those with physical on/off switches are set to off). Going one by one, I discovered that physically pulling off the 3D printer cable, just for the moment of switching the strip, prevents the effect from occurring. I can plug it back a few seconds later and everything still works as it should. I've also never had this breaker tripping during a normal operation.

Do I guess correctly, that the effect is caused by the capacity the devices (and cables?) have; and powering them all at once (even if its only their power supplies) causes a power spike big enough to trip the breaker?

I'm also wondering, if there's anything else which can be done about that, aside from distributing the load over different breakers? This would be troublesome (I'd have to lay a cable to another room), however I'm worried the electronics may not necessarily like such power spikes.

Both power strips have surge protection built in, but it seems to be no help in my situation.