I interviewed with Etsy for an internship position last year. After the on-site was finished, our group of interns was told we'd hear back within a few days (but likely the very next day.) After two weeks of silence, I emailed them asking if they had an update or a new timeline and was told they'd get back to me in a week or so. This happened two or three more times over the next couple months, until I eventually gave up. Like you, I was more confused than anything. Either way, I can't really say I recommend interviewing with them.