TOPIC: Please make preset and user input donations exclusive

Could you please make preset and user input donation amounts exclusive, such that the user will get an error message if choosing a preset and entering a user input amount simultaneously? A donor just suggested this to me, so I tested it and found in DT Donate 2.1.8 that when I entered a preset of $25 plus a user input amount of $1 and clicked "Process Donation" it processed the $1 amount only, with no error message. This can lead to potential mistaken donation amounts.

Can you please fix this by adding a radio button next to the user input amount box?

Thanks so much,
Brandon