how to copy and paste a whole sheet

I have not seen that problem. It works correctly here. I am thinking you are pasting into a table in the new document. Paste and Match Style does not copy/paste cell sizes and borders.

To copy an entire sheet to a new document:

1. Click on the disclosure triangle on the sheet tab and Copy Sheet
2. Create a new document
3. Click on the disclosure triangle on the default Sheet 1 tab and Paste Sheet
4. Click on the disclosure triangle on the Sheet 1 tab and Delete (unless you want to keep it)

To copy selected tables and other objects from a sheet to a new document

1. Select the items to copy
2. Copy
3. Create a new document
4. Delete the default table (unless you want to keep it)
5. Paste onto the empty sheet (or a blank spot on the sheet if you kept the default table)