To gledaš direktno v
Adobe Acrobat Readerju na iOS ali pa v kakšni drugi aplikaciji?
Na računalniku pa se normalno prikaže (Preview, Adobe Reader ...)?
Pike pomenijo, da manjka pisava, ki je bila uporabljena pri ustvarjanju pdf datoteke ali pa, da je pri izvozu prišlo do neke napake, vsaj po tem odgovoru sodeč:
https://community.adobe.com/t5/acrobat/pdf-displaying-dots/td-p/10808675?page=1
Generally, this problem is indicative of a PDF file that
(1) does not have fonts embedded and for which there is no appropriate substitute font on the platform in use and/or
(2) the PDF was not properly created in terms of how the font encoding tables (especially if one or more fonts were not embedded).