RPi3 with Ethernet or WIFI connection doesn't seem to update the UI

I'm not sure what's going on, but after following all of the tutorial for the kiosk on my RPi3b, when it boots, it loads the UI as expected, but the UI never updates states of entities that change...

..example...a markdown card that shows the time, or a clock card, or any sensors, or the calendar.  None of them update without a full refresh of Chromium.  Is that a Pi3 limitation or a bug?