This might be a spelling accent. In Indian subcontinent languages you have to distinguish between t, th, d, and dh, so in roman script you expect the h to be th

This might be a spelling accent. In Indian subcontinent languages you have to distinguish between t, th, d, and dh, so in roman script you expect the h to be there to represent aspiration. If you learn English from texts, from a teacher who learned it from texts, you become fluent without ever mastering the pronunciation. And I imagine it's a bit confusing if your ear is used to four distinctions instead of two. In a similar vein, I listened to a Google video narrated by an employee whose presentation generally was excellent, but who pronounced "snippet" as though it were "snip pet". It was charming but distracting.