Jagged fonts in the pdf invoice

Hi, I'm trying to create custom template for an invoice, and everything works fine until i export the invoice, all the text appears very jagged no matter if i change the font or the font size, i attached a copy to see what i mean.

I thought maybe this was an issue of rendering text over an image, because i created the customer info area with a background image, but it also happens in the invoice table, which has no image background behind it.