I have two hives, one Langstroth and on Top bar hive both with large (4-5 lb) swarms I captured hived in them. The TBH is doing remarkabley well with comb, brood, queen, etc. The Lang on the other hand has had two swarms WITH QUEENS hived into it and has both times swarmed out after a week. These swarms were captured 20 miles away.
I believe everything is right with the Lang, no new paint, new frames, great location.
It's a ten frame, 1 super, inner cover, outer cover,.... the works. No insect infestation.
I just don't get it.