I’ve got a strange problem with the node mentioned in the topic. I’m sorting, and grouping a list of rooms from a linked file. The sorting and grouping is quite complicated, and it mostly works well, but I found a strange anomaly. In the last L3 list, all sublists (L2) get one element that should have been put in somewhere else. Once it’s in the middle of a list, and twice at the beginning of them.
Is this some kind of common error? Maybe when I sorted by Key and replaced some of the Keys with different values this error accrued?