That is one strange mess of parts!! The frame looks like it is probably near entry level and most of the parts look like they are probably original. I don't get the brifters at all, are they only being used as brake levers? The stem shifters are still there, so I assume the brifters don't function... I don't see how they would anyhow?

I'm not ripping on your bike honestly, it's just a strange strange build. Welcome to the forum!
I think the price was fair, the brifters and leather saddle cover the buying cost.