Table 1 in numbers has duplicated and sits over a new table 1-1

move the two tables from each other by doing the following:

• single click in one cell of one of the tables
• click and hold on the table drag control (the concentric circles at the top left):

then select the table you want to get rid of, then type the delete key. of coures if you make a mistake, use the undo command to go back any number of changes

It seems you have accidentally duplicated your table. To remove the table, select it from the sheet menu for , then type the delete key:

command+d is duplicate selection as you can see from the edit menu:

the commands do what they do.

I would not agree with a warning for something like this (my opinion is only my opinion). it punishes all users to help a few. I suggest that remembering that you can undo using the menu item "Edit > Undo" can get you out of accidental commands.

I hope I helped solve your question.