Usually it is the other way around - contributors are added post-combination.
Notice that "Shelfari" added and then removed that contributor. The combination process will kinda add all the primary contributors from each of the combination candidates and, then, "remove" the duplicates that result.
It is odd on this one that the net was, apparently, zero causing you to have to add it again.
Who knows what is going on with Shelfari these days.
posted 8 months ago. ( permalink )