can't edit title block

Hello all, I am working on a drawing and typically when I double click the title block all the boxes highlight and I can go into properties and change the text in the blocks. On this drawing I am working on now when I double click the title block only the line that I click on highlights. On another one when I click the title block just the outline highlights and I get a blue grip box in the lower right hand corner. Did I change something I shouldn't have?

Thanks