Hello Nrmanaaas,
It sounds as though after uninstalling bootcamp and formatting your hard disk, you're still seeing partitions on the disk.
Here is a resource that can help:
How to erase your disk
Specifically, use these steps:
"Choose View > Show All Devices from the menu bar in Disk Utility. The sidebar now shows your disks (devices) and any containers and volumes within them. The disk your Mac started up from is at the top of the list."
Please note these steps would permanently erase the data on the drive, and if possible creating a backup of any important on the drive is recommended.
Here's how to create a backup of your data:
How to backup your Mac
Cheers!