Chrome downloads using space on C: drive, when download folder is on D:?

I have Chrome installed on my C: drive, but the downloads folder for chrome is in my D: drive.

I downloaded a very big (60GB) file off of mega.co.nz using the Chrome Mega extension.

Once it finished the file showed up in my D: drive just fine but my C: drive’s used space seemed to have grown by around 60GB also.

I tried clearing the cache but that didn’t work.

I was wondering why this was happening and how I could fix it?