I get this behavior often now...
If don't set any column sizing, the table always draws correctly, but if I set column sizing (say percentages per column) I sometimes get the following. Pushing updated data to the node, sometimes, most times the table renders correctly but on initial draw, this happens when it happens. It most often happens when this tab is the initial tab when I open the dashboard, or do a deploy, and jump back to this existing session to watch it refresh. If setup a refresh button, and force the same data to the table or revised data, the rendering seems to always be correct, but of course that is not the initial rendering as I noted above.
Maybe I am somehow triggering this, but my flow just collects the data every 5 minutes or so, and then send it to the ui_table object as applicable. I don't recall seeing this until recently, about NR 1.1.0 or so, but it could be that I just had not done enough tables to see it? Anyone else seeing this?