Arabic writing doesn't have capitalization. What language were they writing? It sounds like they noticed that proper nouns were capitalized but maybe felt the other rules about capitalization were too much bother. I even get confused sometimes about capitalizing in titles.

Arabic doesn't have capital letters.

Based. Letter casing a mistake. We only have it because Charlemagne's scribes decided to use a different font for their Latin, and then it stuck, leaving us with double the character set, input handling bugs to fix, and shit to argue about.