I saw multiple bug reports similar to our issue, but most of them are Complete or Closed.

We have a very basic table with top header row, but on mobile the headers are taking over the whole left-hand column and not bold anymore. See example here: https://passportoffice.umn.edu/test

Here we have an example with images as a header, but on mobile it looks even worse. Maybe because of the images? https://passportoffice.umn.edu/passport-fees