Clear your cookies, history, and caches. Then fully quit your browser and reopen. That will hopefully fix it. I run Safari with VPN for this board and I get that problem if I use the same browser for twatter at the same time for some reason. So I use Safari for QR and Brave for twatter. I have had to do this since we moved to 8ch or it either doesn't auto-update or lags updates by like one post every 3-4 minutes.
Hopefully that will help you out.