Is it normal for my amended Fed 2020 1040X to only so my adjusted tax owed without adding in the amount erroneously refunded to me on my initial return?

The original refund should be on the amended return.  

Go by the actual 1040X.  Line 18 should be your original refund amount and line 22 should be your additional refund.  If you paid on your original return it will be on line 16.  If there is an amount owed with the amendment, it will be on line 20.