just replicated it from mobile, i originally played on my laptop but it happens on both. Both use firefox. When u hit restart it says welcome to day one but the top bar says day 7 and if u play thru the day it is treated as day 7. Another bug related to restart, I figured maybe i could just buy stocks with the $50 and it would not be wiped when finished and restart on day 7 again. Which it did not wipe so I made a bunch of purchases in cheap stock restart the day and bought more to get lots of dividends and since I had insane amounts of stock at a cheap price, a $3 increase was big (buying in higher than 10 intervals would be nice like just an input field. not intended but I like making infinite free money :D.
also save state is completely my personal opinion adds no harm one way or the other. It just came from me trying to reload after playing a few days and seeing there was a news button (which come from never reading tutorials) and wanting to refresh the page to start over. instead i just had to clear cookies.
I think this is a fun game