Mojave - pop in speakers from first connection

so I just installed and connected Mojave for the first time - I am relatively new to modular. I was patching between various other modules in my session and the ES-9 interface - no issues so far

…then after a while started to patch in Mojave for the first time to my es-9 and heard a “pop” from my speaker - just with the first connection from the R output jack to es-9 input .

it was the first time this Mojave output jack has been used. Everything behaved normally after that. I guess just some voltage escaping? after this I couldn’t reproduce the issue

btw the es-9 is connected to a monitor controller / amplifier.

Is it normal to get occasional pops from speakers when patching between modules? just wondering if everything is ok