Why do I have less gold than I started with when I try to exchange items in the beginning?

So I was watching a streamer the other day and he picked the wrong first items and he immediately returned it and bought what he originally wanted. When I get something, realise it's wrong and try to get what I originally wanted for eg, corrupting instead of Dorian's there is a deficit of gold. What am I doing wrong? Sorry if this a noob question.
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