From looking at the last picture, you have either a drone-laying queen or you have a laying worker. In both case, they can only lay unfertilized eggs which turn into drones.
Because drones are larger, they end up either re-working the comb or drawing out foundation badly. You will see "bullet-shaped" brood capping, often by themselves, very scattered laying pattern.
You won't see regular capped worker brood which will be flat regular cappings.
If you can't see a queen then they probably have a laying worker. If they had flat capped worker brood in the past then you had a queen that may have died, and they didn't raise another successfully. If you never saw that, then likely the queen died before she could lay.
Do you have a queen in there? Either way you've got a big problem with the hive.