Looks like Opus can't really see new folders whilst lister being filtered.
Let me explain through an example:
You filter the Lister Left that contains entire "2025" for "2025.08"
You create a new folder for example "2025.08. Folder 1"
You move some files from Lister Right over to "2025.08. Folder 1" - everything is fine
You create a new folder for example "2025.08. Folder 2" - the folder is indeed visible in that Lister Left
You want to move (drag and drop )some files from Lister Right over to "2025.08. Folder 2" in Lister Left -> the system can't detect this folder on drag'n'drop and it's likely that if you don't notice this, the files would end up to be moved in its parent folder ("2025" in this case)
The second folder doesn't appear at all for me, but your description sounds different? Can you give more detail, e.g. how are you creating the folders, and how are you moving the files?
nothing special really, it's all related to copying and moving with filter on
basically - you just use filter to copy some files into the folders and then you click on checkbox "Show Everything" - and then you see the files as displayed above, but the > marker is in closed state instead of being in open state... I mean - whatever is alright as long as it's consistent - being it closed or open