Gujarati has its own numeral forms, separate from the Devanagari set used for Hindi and separate again from the Western digits. Three possible ways to write the same number, and a tool will generally reach for whichever it knows best rather than the one matching the rest of the caption.
That would be a footnote if numbers were rare. They are not. Prices, dates, times, quantities, ages, scores and phone numbers turn up in almost every kind of video, so a file will usually contain several chances to get this wrong.
The visible fault is inconsistency more than the choice itself. A caption that uses one numeral form throughout reads fine whichever form it is. A caption that switches between them partway through reads as careless, in the same way mixed spelling does in Roman script languages.
So decide once, at the start, and then check the file specifically for the other forms before you publish. It is a fast check and it is not one that any automatic validator will do for you.