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Likely in the same vein as "please do the needful", just a common translation / usage quirk.

Not incorrect when the speaker or millieu is Indian, but it would grate a little to claim it is more correct than "I have a question." Saying "I have a doubt" is almost le Carré, a spymaster weighing fragments of deception.

Regional dialects and quaint idioms are absolutely English though. How else to add tone and shading to our communication? It's the sand the forces the oyster to make pearls.

In my case it was Brazilians simply naively translating their native "Tenho uma dúvida".

Everyone was learning American or British English. No one was trying to learn Indian English ;)