How to add an "end of row" formatting character?

EDIT/SOLUTION: I found that the problem rows did not actually terminate with the rest of the table. So, the main table had 3 columns, the problem rows had only 2 columns, but the right border of the cell coincided with the right border of the main table, thus making it appear correct, but hiding the end of row character.

ORIGINAL POST:

I have a table that I've found does not contain the "end of row" character and would like to know if I can add one manually.

In this example the rows with "Siplast" do not have the "end of row" character, but the rows for "Soprema" do.

In addition to knowing if I can add these manually, I'd be curious to know how they get created (or why they wouldn't get created).

Thanks!