Not able to delete the schema/Table
Hi,
I have created a table Label="EXT20 Card unlinked event", name="cardUnLinkedEvent" and also one more schema was accidentally created with Label="EXT20 Card Unlinked Event", name="cardUnLinkedEvent". Not sure how it allowed to create with same name. when i tried to rename one of them, two more schema/Table got created. (All four highlighted in blue)

Now, i want to delete all the four schema, but i am getting below error while deleting any of these schema.

Also, while updating the database structure for any of the new schema in that instance I am getting below error.

All the four schemas are custom build, there are no records in schema/Table, there is no linking used in the schema, there is no dependency on this four schema.
How can i delete this four schema?