Drone brood found in Super!?

[Abbee]

Just when you think you've seen everything.
On expecting one of the hives today, we noticed while removing the 3 supers that there were, what looked like drone capped cells in the bottom of the bottom super and on the top side of the Q Excluder. A lot damaged from lifting off the supers.
We inspected the brood box and not only found the queen but a massive amount of brood with great pattern, and loads of larvae. She's a great queen.
So a bit puzzled.
We then inspected the supers and it looks like a laying worker's doing as the drone brood was very bumpy and pimply. A bit on the bottom of the 2 middle frames and a very small scattering on the bottom of the 2 middle frames of the middle super.

We thought maybe the queen got through but she's a good sized queen so unlikely and even so why wouldn't she carry on laying normal brood up there instead of just drone at the bottom tip of the frames?
But why would there be a laying worker when we have an excellent queen doing really well? Has anyone one had anything similar?

 

[jenkinsbrynmair]

it's a regular occurence in a healthy hive

 

[Boston Bees]

Bees, understandably, find the idea of a queen excluder completely baffling and unnatural. This is one of the side effects of that bafflement.

(I use them too)

 

[drex]

They tend to hav drone brood at the periphery of the brood nest, and if they have brood up against the excluder, then above it is the periphery. Possibly a faulty excluder or a slimline queen. No panic. Unlikely to be laying workers in the presence of healthy worker brood and a good queen. Drones cells from workers tend to be scattered but usually in a solid patch when laid by the queen.

 

[Abbee]

Oh Thanks guys. Good to know