The issue is in the Admin panel. The style sheet editor is not reflecting changes to .t_standard in the preview area. As soon as you visit the Pagination Properties you can see where the comment is getting it colors
The <table> tag defines an HTML table.
.t_standard is a HTML table, not a cell.
t = table
standard = standard
t_standard = standard table
The <td> tag defines a standard data CELL in an HTML table.
.tdheader is a CELL within the header of a table.
td = a table cell
header = header
tdheader = table header, which also styles the th element.
An HTML table consists of one <table> element and one or more <tr>, <th>, and <td> elements.
The <tr> element defines a table row, the <th> element defines a table header, and the <td> element defines a table cell.
you are coloring the .t_standard <table> element that is being overwritten by your tdheader <td> element.2 -
in the style editor preview, the section you have circled is for human visual reference only. it is not used anywhere else in the program. it is a notation of what's to follow. it is a header for the items below it in that group.