Table borders not showing in Andressen theme



This is my first post here, so I hope this is the right place.

I have had a few issues using Pressbooks, but I’ll just focus on one for now.

I noticed recently my tables have changed in my book. Even though I have chosen for the tables to have a border, they are now gone, and it makes some of my tables look strange.

Example page–tables towards the bottom, and one table with images just got crazy wonky:

In the past, the tables were fine, except for ones where I did NOT want a border–they still had a bottom line even when I set the border to 0. Now THAT is fixed, but all tables have no borders for me.

Can anyone help? Is this a bug?