Delay in Historical Data Candle

In my case, I am fetching historical data for 5 min interval. Got one issue today(27/12/2019).

OHLC value will be same for 5 min time interval. i.e.
Following 2019-12-27 15:15:00 candle OHLC value

[open] => 195.85
[high] => 196
[low] => 194.6
[close] => 195

This value will continue upto 15:19:59 and at 15:20:01, a new candle should be formed but it does not happen. A new candle is formed around 15:20:30.

Please clear why this delay is happen.

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