Oh, I see... I will try to redesign the title block with another fonts, but I don't get why sometimes fails the bold one or the bold condensed, when it's always the same font (although it is not a standard font) because on the layout I see as I wanted to be printed on the pdf (it's look a bit strange, but when I zoom in the fonts looks fine, and the ones that recognize the pdf, looks fine too): 

Do you recommend me to upgrade my Autocad to solve this?