Brace comb under frames in brood box

[dickbowyer]

I usually put a super under my National brood boxes to provide honey for bees to overwinter. I inspected one hive today where I had moved such an empty super above a queen excluder last week. OSR is in flower locally and hive has 7 frames of BIAS. Surprised to see loads of brace comb under the brood box frames. Can anyone give an explanation? Similar local hives of mine have not shown such behaviour.

 

[moo]

Sometimes they just want a ladder in place to make it easier to get onto the combs (and handy cells to offload)

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sent from my smartphone.. although it doesn't filter my not-so-smart comments

 

[Skyhook]

My paines poly hives have a oversize space between floor and frames, and they always do it in there but not my other hives.