iframe not loading html table

I am running a powershell script to grab tye users logged on to a device. This is output to a html file in form of a table with some formtatting. I copy this to the public directory on the core server. In the map i have a custom html object. In the html before i use an ifram to load the file which works but it doesn’t load any formatting at all just the data. It also doesn’t seem to refresh when the file gets updated with additinal rows.

What options do i have to load the htm file with the correct table formatting?