Thanks!
By the way, I noticed that every time I leave from the processor in packed mode it sends a signal to load the SE rocket with parts.
https://i.imgur.com/SKienZA.jpeg
Interestingly, all combiners take the signal from the same input (rocket fully loaded with all parts&fuel).
It looks like rocket ready signal is true(checkbox sign) but rocket inventory is not yet sended to middle combinators (if capsule <1 ).
This causes the inserter to insert one capsule each time i exit from processor.
Some kind of race condition when placing/activating packed processor on surface?
When I leave with packed mode turned OFF this does not happen.