?? For every question

I’m born and raised in US, my parents are Tamil and lately I’ve been visiting Tamil Nadu often. One thing I noticed amongst many Indians is whenever they ask a question they use 2 question marks.

Why do they do this?

In western norms when you see “??” It’s an emphasis implying stress/urgency. When someone does that for every question it gets on my nerves so I’m hoping to see if there’s some other intention that I do not understand.