What Printing Oddity Is This On This C90 Airmail Stamp?

Hello,

I found this and some similar stamps in an album marked as "double impression". I doubt if this is correct - the design is doubled completely, that's true, but the doubled colors are a bit weaker.

I know this link: http://www.re-entries.com/terms.html
But it's difficult to understand all of these terms, also, the term "double transfer" is missing on this list for example, which I find often for US stamps.

So back to my stamp: is this what you would call a kiss print, or double impression? I guess it's not just a color shift. I didn't find any information in the Scott specialized for this at the C90.

looks like a tagging ghost - tagging roller picks up un-dried ink from one stamp and re-deposits it on another stamp

thank you very much - I never heard this term before, but I think that's it. I show another - even more obvious - example. Here it's even tripled - also a possible tagging ghost?

what I only wonder about is the large distance between the original design and the ghost (and in this case the two directions from the original design to the "ghosts").

I am still wondering about my stamps here... I didn't find more detailed technical explanations for "ghost tagging" or "tagging ghost". I believe and learned that this can be it, but how does it work that it's in two directions? (in my last stamp above)