Historical data is returning bad data (not consistent)

When fetching data via the Python Kite Connect historical API, I noticed that some candle values differ on successive fetches a few seconds apart. The candles that vary seem to differ each time. Sometimes, you may not see any difference,,but if repeated enough number of times, you can spot the issue. For example, here is code that fetches 5 minute Bank Nifty candles. I have seen this happen for stocks as well and for all timeframes. However, it is easier to reproduce on smaller timeframes, like 5 or 15 minutes.

from kiteconnect import KiteConnect
 
# Set API_KEY and ACCESS_TOKEN to your credentials.
# 260105 is the symbol token for Bank Nifty.
def Test():
  API_KEY = ''
  ACCESS_TOKEN = ''
  kc = KiteConnect(API_KEY, ACCESS_TOKEN)
  for c in kc.historical_data(260105, '2021-03-30', '2021-07-07', '5minute'):
    candle = [
      c['date'].strftime('%Y-%m-%dT%H:%M:%S+0530'),
      c['open'],
      c['high'],
      c['low'],
      c['close'],
      c['volume']
    ]
    print(candle)
Test()

I saved the code above in a file named failure.py. Then I run this from the (Linux) command line:
python3 failure.py > log_1
sleep 5
python3 failure.py > log_2
diff log_1 log_2

And this is the output of the diff command above. Notice carefully the candles that differ.

2706,2707c2706,2707
< ['2021-05-25T09:40:00+0530', 34888.1, 34888.1, 34798.45, 34815.4, 0]
< ['2021-05-25T09:45:00+0530', 34822.4, 34822.4, 34738.15, 34741.9, 0]
---
> ['2021-05-25T09:40:00+0530', 34888.1, 34888.1, 34798.45, 34824.95, 0]
> ['2021-05-25T09:45:00+0530', 34824.4, 34824.4, 34738.15, 34741.9, 0]
2779,2781c2779,2781
< ['2021-05-26T09:30:00+0530', 34559.8, 34577.25, 34518.65, 34528.45, 0]
< ['2021-05-26T09:35:00+0530', 34508.3, 34549.8, 34499.1, 34511.75, 0]
< ['2021-05-26T09:40:00+0530', 34507.55, 34515.8, 34463.25, 34508.1, 0]
---
> ['2021-05-26T09:30:00+0530', 34559.8, 34577.35, 34510.35, 34525.25, 0]
> ['2021-05-26T09:35:00+0530', 34523.9, 34554.9, 34498.35, 34511.45, 0]
> ['2021-05-26T09:40:00+0530', 34505.85, 34515.8, 34463.25, 34508.1, 0]