Firewall->Settings->Normalization
Hovering over any item under general settings such as disable interface scrub, ip do not fragment or ip random id hides the text by giving it the same color as the background color.
I use the tukan theme , but I bet there is something inconsistent with the GUI itself.
this is noticeable on the tukan theme, but it seems that the ".table-hover" class is not needed for this table, yes