Get overlapping actors issue

look, that dungeon generator thing is not what im looking for here. The type of generation i want to make are squares with the same size or double:


the only problem im having is that when i spawn a resized chunk, only two of the chunks it is overlapping get destroyed, im just asking for an answer to why that happens, i dont need to rewrite everything, i have even done a dungeon generator before and it works perfectly but thats not what im looking for here.

Still i appreciate ur help